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LTC2845 3.3V Software-Selectable Multiprotocol Transceiver
FEATURES
s s
DESCRIPTIO
s
s s
Software-Selectable Transceiver Supports: RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 Operates from Single 3.3V Supply with LTC2846 or a Single 5V Supply with 3.3V Logic with LTC2847 TUV Rheinland of North America Inc. Certified NET1, NET2 and TBR2 Compliant, Report No.: TBR2/050101/02 Complete DTE or DCE Port with LTC2846 or LTC2847 Available in a 36-Lead Narrow (0.209") SSOP and 38-Lead (7mm x 5mm) QFN package
The LTC(R)2845 is a 5-driver/5-receiver multiprotocol transceiver. The LTC2845 and LTC2846 form the core of a complete software-selectable DTE or DCE interface port that supports the RS232, RS449, EIA530, EIA530-A, V.35, V.36 or X.21 protocols. The LTC2845 operates from a 3.3V supply and supplies provided by the LTC2846. This part is available in a 36-lead SSOP and 38-lead (7mm x 5mm) QFN package. The LTC2845 and LTC2847 in QFN packages offer the smallest multiprotocol serial port available.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s s s
Data Networking CSU and DSU Data Routers
TYPICAL APPLICATIO
DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
RL TM RI LL CTS DSR DCD DTR RTS RXD RXC TXC SCTE TXD
LTC2845 D5 R5 R4 D4 D3 R3 R2 R1 D2 D1 R3 R2
R1
T
T
21
RL A (140)
25
TM A (142)
*
RI A (125)
18 13 5
LL A (141) CTS B CTS A (106) DSR B
22 6
DSR A (107)
10 8
DCD B DCD A (109)
23 20 19 4
DTR B DTR A (108) RTS B RTS A (105) SHIELD (101)
1
SG (102)
7
16
RXD B
3
RXD A (104)
9
RXC B
17
RXC A (115)
DB-25 CONNECTOR
U
LTC2846 D3 D2 D1 T T T 12
TXC B TXC A (114)
U
U
15 11
SCTE B SCTE A (113)
24 14
TXD B
2
TXD A (103)
*OPTIONAL
2845 TA01
sn2845 2845fs
1
LTC2845
ABSOLUTE MAXIMUM RATINGS
Supply Voltage VCC ....................................................... -0.3V to 6.5V VIN ..................................................................... - 0.3V to 6.5V VEE ...................................................................... -10V to 0.3V VDD ..................................................................... - 0.3V to 10V Input Voltage Transmitters ........................... - 0.3V to (VCC + 0.3V) Receivers ............................................... - 18V to 18V Logic Pins .............................. - 0.3V to (VCC + 0.3V) Output Voltage Transmitters .................. (VEE - 0.3V) to (VDD + 0.3V) Receivers ................................. - 0.3V to (VIN + 0.3V)
PACKAGE/ORDER INFORMATION
TOP VIEW VCC VDD D1 D2 D3 R1 R2 R3 D4 1 2 3 4 5 6 7 8 9 R1 R2 R3 D4 R4 R5 D5 G PACKAGE 36-LEAD PLASTIC SSOP D3 D1 D2 36 VEE 35 GND 34 D1 A 33 D1 B 32 D2 A 31 D2 B 30 D3/R1 A 29 D3/R1 B 28 R2 A 27 R2 B 26 R3 A 25 R3 B 24 D4 A 23 R4 A 22 R5 A 21 D5 A 20 VIN 19 VCC
ORDER PART NUMBER LTC2845CG LTC2845IG
D2 1 D3 2 R1 3 R2 4 R3 5 D4 6 R4 7 M0 8 M1 9 M2 10 NC 11 DCE/DTE 12
38 37 36 35 34 33 32 31 D1 B 30 D2 A 29 D2 B 28 D3/R1 A 27 D3/R1 B 39 26 R2 A 25 R2 B 24 R3 A 23 R3 B 22 D4 A 21 R4 A 20 R5 A 13 14 15 16 17 18 19
R5 D5 VCC VIN D4ENB R4EN D5 A
D1 A
GND
VDD
VCC
VEE
VEE
D1
R4 10 M0 11 M1 12 M2 13 DCE/DTE 14 D4ENB 15 R4EN 16 R5 17 D5 18
TJMAX = 125C, JA = 90C/ W, JC = 35C/ W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VCC = 5V, VIN = 3.3V, VDD = 8V, VEE = - 7V for V.28, - 5.5V for V.10, V.11 (Notes 2, 3)
SYMBOL Supplies ICC VCC Supply Current (DCE Mode, All Digital Pins = GND or VIN) RS530, RS530-A, X.21 Modes, No Load RS530, RS530-A, X.21 Modes, Full Load V.28 Mode, No Load V.28 Mode, Full Load No-Cable Mode
q q q q
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
2
U
U
W
WW
U
W
(Note 1)
Short-Circuit Duration Transmitter Output ..................................... Indefinite Receiver Output .......................................... Indefinite VEE .................................................................. 30 sec Operating Temperature Range LTC2845C ............................................... 0C to 70C LTC2845I ........................................... - 40C to 85C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
TOP VIEW
ORDER PART NUMBER LTC2845CUHF LTC2845IUHF
UHF PART MARKING 2845 2845I
UHF PACKAGE 38-LEAD (7mm x 5mm) PLASTIC QFN
TJMAX = 125C, JA = 34C/ W EXPOSED PAD IS VEE (PIN 39) MUST BE SOLDERED TO PCB
MIN
TYP 2.7 110 1 1 700
MAX
UNITS mA mA mA mA A
sn2845 2845fs
150 3 3 1400
LTC2845
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VCC = 5V, VIN = 3.3V, VDD = 8V, VEE = - 7V for V.28, - 5.5V for V.10, V.11 (Notes 2, 3)
SYMBOL IEE PARAMETER VEE Supply Current (DCE Mode, All Digital Pins = GND or VIN) CONDITIONS RS530, RS530-A, X.21 Modes, No Load RS530, X.21 Modes, Full Load RS530-A, Full Load V.28 Mode, No Load V.28 Mode, Full Load No-Cable Mode RS530, RS530-A, X.21 Modes, No Load RS530, RS530-A, X.21 Modes, Full Load V.28 Mode, No Load V.28 Mode, Full Load No-Cable Mode All Modes Except No-Cable Mode RS530, RS530-A, X.21 Modes, Full Load V.28 Mode, Full Load
q
ELECTRICAL CHARACTERISTICS
MIN
TYP 2 23 34 1 12 10 0.3 0.3 1 13.5 10 650 240 64
MAX
UNITS mA mA mA mA mA A mA mA mA mA A A mW mW V
IDD
VDD Supply Current (DCE Mode, All Digital Pins = GND or VIN)
IVIN PD
VIN Supply Current (DCE Mode, All Digital Pins = GND or VIN) Internal Power Dissipation (DCE Mode, All Digital Pins = GND or VIN) Logic Input High Voltage Logic Input Low Voltage Logic Input Current
Logic Inputs and Outputs VIH VIL IIN 2 0.8 0.5 -30 2.7 -75 3 0.2 -30 -85 0.4 50 -160 10 5 0.5VODO 2 0.67VODO 0.2 3 0.2 150
q q q q q q q q q
VCC = 5V R4EN when VCC = 3.3V D1, D2, D3, D4, D5 M0, M1, M2, DCE, D4ENB, R4EN = GND M0, M1, M2, DCE, D4ENB, R4EN = VIN IO = -3mA IO = 1.6mA 0V VO VIN M0 = M1 = M2 = VIN, VO = GND M0 = M1 = M2 = VIN, VO = VIN RL = 1.95k (Figure 1) RL = 50 (Figure 1)
q q q q q q q q q
V V A A A V V mA A A V V V V V V mA A ns ns ns ns ns ns ns ns ns
sn2845 2845fs
10 -120 10
VOH VOL IOSR IOZR V.11 Driver VODO VODL VOD VOC VOC ISS IOZ tr, tf tPLH tPHL t tSKEW
Output High Voltage Output Low Voltage Output Short-Circuit Current Three-State Output Current
Open Circuit Differential Output Voltage Loaded Differential Output Voltage Change in Magnitude of Differential Output Voltage Common Mode Output Voltage Change in Magnitude of Common Mode Output Voltage Short-Circuit Current Output Leakage Current Rise or Fall Time Input to Output Input to Output Input to Output Difference, tPLH - tPHL Output to Output Skew
q q
RL = 50 (Figure 1) RL = 50 (Figure 1) RL = 50 (Figure 1) VOUT = GND -0.25V VO 0.25V, Power Off or No-Cable Mode or Driver Disabled LTC2845C (Figures 2, 5) LTC2845I (Figures 2, 5) LTC2845C (Figures 2, 5) LTC28451 (Figures 2, 5) LTC2845C (Figures 2, 5) LTC2845I (Figures 2, 5) LTC2845C (Figures 2, 5) LTC2845I (Figures 2, 5) (Figures 2, 5)
q q q
1 2 2 20 20 20 20 0 0 15 15 40 40 40 40 3 3 3
100 25 35 65 75 65 75 12 17
3
LTC2845
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VCC = 5V, VIN = 3.3V, VDD = 8V, VEE = - 7V for V.28, - 5.5V for V.10, V.11 (Notes 2, 3)
SYMBOL VTH VTH IIN RIN tr, tf tPLH tPHL t V.10 Driver VO VT ISS IOZ tr, tf tPLH tPHL VTH VTH IIN RIN tr, tf tPLH tPHL t V.28 Driver VO ISS IOZ SR tPLH tPHL Output Voltage Short-Circuit Current Output Leakage Current Slew Rate Input to Output Input to Output Open Circuit RL = 3k (Figure 3) VO = GND -0.25V VO 0.25V, Power Off or No-Cable Mode or Driver Disabled RL = 3k, CL = 2500pF (Figures 3, 7) RL = 3k, CL = 2500pF (Figures 3, 7) RL = 3k, CL = 2500pF (Figures 3, 7)
q q q q q q q
ELECTRICAL CHARACTERISTICS
PARAMETER Input Threshold Voltage Input Hysteresis Input Current (A, B) Input Impedance Rise or Fall Time Input to Output Input to Output Input to Output Difference, tPLH - tPHL
CONDITIONS -7V VCM 7V -7V VCM 7V -10V VA,B 10V -10V VA,B 10V (Figures 2, 6) LTC2845C CL = 50pF (Figures 2, 6) LTC2845I CL = 50pF (Figures 2, 6) LTC2845C CL = 50pF (Figures 2, 6) LTC2845I CL = 50pF (Figures 2, 6) LTC2845C CL = 50pF (Figures 2, 6) LTC2845I CL = 50pF (Figures 2, 6) Open Circuit, RL = 3.9k RL = 450 (Figure 3) RL = 450 (Figure 3) VO = GND -0.25V VO 0.25V, Power Off or No-Cable Mode or Driver Disabled RL = 450, CL = 100pF (Figures 3, 7) RL = 450, CL = 100pF (Figures 3, 7) RL = 450, CL = 100pF (Figures 3, 7)
q q q q q q q q q q q q q
MIN -0.2
TYP
MAX 0.2
UNITS V mV mA k ns
V.11 Receiver 15 15 30 15 50 50 50 50 0 0 4 3.6 0.9VO 150 0.1 2 1 1 -0.25 25 15 30 15 55 109 60 10 150 1 4 1.3 1.3 100 30 2.5 2.5 0.25 50 0.66 100 4 4 80 90 80 90 16 21 6 40 0.66
ns ns ns ns ns ns V V mA A s s s V mV mA k ns ns ns ns V V mA A V/s s s
Output Voltage Output Voltage Short-Circuit Current Output Leakage Current Rise or Fall Time Input to Output Input to Output Receiver Input Threshold Voltage Receiver Input Hysteresis Receiver Input Current Receiver Input Impedance Rise or Fall Time Input to Output Input to Output Input to Output Difference, tPLH - tPHL
q q
V.10 Receiver
-10V VA 10V -10V VA 10V CL = 50pF (Figures 4, 8) CL = 50pF (Figures 4, 8) CL = 50pF (Figures 4, 8) CL = 50pF (Figures 4, 8)
q q
5
8.5
sn2845 2845fs
4
LTC2845
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VCC = 5V, VIN = 3.3V, VDD = 8V, VEE = - 7V for V.28, - 5.5V for V.10, V.11 (Notes 2, 3)
SYMBOL PARAMETER V.28 Receiver VTHL Input Low Threshold Voltage VTLH Input High Threshold Voltage VTH Receiver Input Hysterisis RIN Receiver Input Impedance tr, tf Rise or Fall Time tPLH Input to Output tPHL Input to Output CONDITIONS
q q q
ELECTRICAL CHARACTERISTICS
MIN
TYP
MAX 0.8
UNITS V V V k ns ns ns
2 3 0.1 5 15 60 150 0.3 7 100 500
-15V VA 15V CL = 50pF (Figures 4, 8) CL = 50pF (Figures 4, 8) CL = 50pF (Figures 4, 8)
q q q
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: All currents into device pins are positive; all currents out of device are negative. All voltages are referenced to device ground unless otherwise specified.
Note 3: All typicals are given for VCC = 5V, VIN = 3.3V, VDD = 8V, VEE = - 7V for V.28, - 5.5V for V.10, V.11 and TA = 25C.
TYPICAL PERFOR A CE CHARACTERISTICS
RS530, X.21 in DCE Mode (Three V.11, Two V.10 Drivers with Full Load) ICC vs Data Rate
140 TA = 25C 135 130 34 30 28 34 TA = 25C
ICC (mA)
IDD (mA)
IEE (mA)
125 120 115 110 105 10 100 1000 DATA RATE (kBd) 10000
2845 G01
125 120 115
RS530, X.21 in DCE Mode (Three V.11, Two V.10 Drivers with Full Load) ICC vs Temperature
34.6 34.4 34.2
110 105 100 95 -40 -20
33.8 33.6 33.4 33.2
IDD (mA)
ICC (mA)
IEE (mA)
20 60 0 40 TEMPERATURE (C)
UW
80
2845 G04
RS530-A in DCE Mode (Three V.10 Drivers with Full Load) IEE vs Data Rate
16 15 14 13 12 11 10 9 8 10 30 40 50 60 70 80 100 20 DATA RATE (kBd) 2845 G02 7
V.28 in DCE Mode (Five V.28 Drivers with Full Load) IDD vs Data Rate
TA = 25C
26 24 22 20 18
10
20 30 40 50 60 70 80 100 2845 G03 DATA RATE (kBd)
RS530-A in DCE Mode (Three V.10 Drivers with Full Load) IEE vs Temperature
13.9 13.8 13.7 13.6 13.5 13.4 13.3 13.2 0 20 40 60 TEMPERATURE (C) 80 100
V.28 in DCE Mode (Five V.28 Drivers with Full Load) IDD vs Temperature
34.0
100
33.0 -40 -20
13.1 -40 -20
2845 G05
0 20 40 60 TEMPERATURE (C)
80
100
2845 G06
sn2845 2845fs
5
LTC2845
PIN FUNCTIONS
VCC (Pins 1, 19/Pins 17, 36): Positive Supply for the Transceivers. Connect to VCC Pin 8 on LTC2846 or to 5V supply. Connect a 1F capacitor to ground. VDD (Pin 2/Pin 37): Positive Supply Voltage for V.28. Connect to VDD Pin 7 on LTC2846 or 8V supply. Connect a 1F capacitor to ground. D1 (Pin 3/Pin 38): TTL Level Driver 1 Input. D2 (Pin 4/Pin 1): TTL Level Driver 2 Input. D3 (Pin 5/Pin 2): TTL Level Driver 3 Input. R1 (Pin 6/Pin 3): CMOS Level Receiver 1 Output. Receiver outputs have a weak pull up to VIN when high impedance. R2 (Pin 7/Pin 4): CMOS Level Receiver 2 Output. R3 (Pin 8/Pin 5): CMOS Level Receiver 3 Output. D4 (Pin 9/Pin 6): TTL Level Driver 4 Input. R4 (Pin 10/Pin 7): CMOS Level Receiver 4 Output. M0 (Pin 11/Pin 8): TTL Level Mode Select Input 0. Mode select inputs pull up to VIN. M1 (Pin 12/Pin 9): TTL Level Mode Select Input 1. M2 (Pin 13/Pin 10): TTL Level Mode Select Input 2. DCE/DTE (Pin 14/Pin 12): TTL Level Mode Select Input. Logic high enables Driver 3. Logic low enables Receiver 1. D4ENB (Pin 15/Pin 13): TTL Level Enable Input. Logic low enables Driver 4. Pulls up to VIN. R4EN (Pin 16/Pin 14): TTL Level Enable Input. Logic high enables Receiver 4. Pulls up to VIN. R5 (Pin 17/Pin 15): CMOS Level Receiver 5 Output.
6
U
U
U
(G-36/QFN-38 Packages)
D5 (Pin 18/Pin 16): TTL Level Driver 5 Input. VIN (Pin 20/Pin 18): Positive Supply for the Receiver Outputs. 3V VIN 3.6V. Connect a 1F capacitor to ground. D5 A (Pin 21/Pin 19): Driver 5 Inverting Output. R5 A (Pin 22/Pin 20): Receiver 5 Inverting Input. R4 A (Pin 23/Pin 21): Receiver 4 Inverting Input. D4 A (Pin 24/Pin 22): Driver 4 Inverting Input. R3 B (Pin 25/Pin 23): Receiver 3 Noninverting Input. R3 A (Pin 26/Pin 24): Receiver 3 Inverting Input. R2 B (Pin 27/Pin 25): Receiver 2 Noninverting Input. R2 A (Pin 28/Pin 26): Receiver 2 Inverting Input. D3/R1 B (Pin 29/Pin 27): Receiver 1 Noninverting Input and Driver 3 Noninverting Output. D3/R1 A (Pin 30/Pin 28): Receiver 1 Inverting Input and Driver 3 Inverting Output. D2 B (Pin 31/Pin 29): Driver 2 Noninverting Output. D2 A (Pin 32/Pin 30): Driver 2 Inverting Output. D1 B (Pin 33/Pin 31): Driver 1 Noninverting Output. D1 A (Pin 34/Pin 32): Driver 1 Inverting Output. GND (Pin 35/Pin 33): Ground. VEE (Pin 36/Pins 34, 35): Negative Supply Voltage. Connect to VEE Pin 31 on LTC2846 or to -7V supply. Connect a 1F capacitor to ground. EXPOSED Pad VEE (Pin 39): Must be Soldered to PCB.
sn2845 2845fs
LTC2845
BLOCK DIAGRA
VCC 1 VDD 2
D1 3
D1 33 D1B 32 D2A
D2 4
D2 31 D2B 30 D3/R1 A
D3
5
D3 10k 20k 6k S3
R1
6
R1 28 R2A 20k 10k 6k S3
R2 7
R2 10k
R3
8
R3 10k
D4
9
D4
R4 10
R4 S3
DCE/DTE 14 D4ENB 15 R4EN 16 10k R5 17 R5 S3 22 R5A 20k 6k
D5 18
D5
M0 11 M1 12 M2 13 20 VIN 19 VCC
2845 BD
W
36 VEE 35 GND 34 D1A 10k 20k 29 D3/R1 B 27 R2B 20k 26 R3A 20k 10k S3 6k 25 R3B 20k 24 D4A 23 R4A 10k 20k 6k 21 D5A MODE SELECTION LOGIC
TEST CIRCUITS
A RL VOD RL B VOC
2845 F01
Figure 1. V.11 Driver Test Circuit
B A
RL 100
CL 100pF CL 100pF
B A
R
CL
2845 F02
Figure 2. V.11 Driver/Receiver AC Test Circuit
D
A CL RL
2845 F03
Figure 3. V.10/V.28 Driver Test Circuit
D
A
A
R CL
2845 F04
Figure 4. V.10/V.28 Receiver Test Circuit
sn2845 2845fs
7
LTC2845
ODE SELECTIO
MODE NAME Not Used (Default V.11) RS530A RS530 X.21 V.35 RS449/V.36 V.28/RS232 No Cable Not Used (Default V.11) RS530A RS530 X.21 V.35 RS449/V.36 V.28/RS232 No Cable M2
0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
MODE NAME Not Used (Default V.11) RS530A RS530 X.21 V.35 RS449/V.36 V.28/RS232 No Cable Not Used (Default V.11) RS530A RS530 X.21 V.35 RS449/V.36 V.28/RS232 No Cable
M2
0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
Note 1: Driver inputs are TTL level compatible. Note 2: Unused receiver inputs are terminated with 30k to ground. Note 3: Receiver outputs are CMOS level compatible and have a weak pull-up to VIN when Z. Note 4: Driver 4 is enabled by D4ENB=0 (Pin 15). Note 5: Receiver 4 is enabled by R4EN=1 (Pin 16).
8
U
M1 M0 DCE /DTE 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 (Note 1) (Note 4) (Note 1) D1, D2, D3 D4, D5 TTL TTL TTL TTL TTL TTL TTL X TTL TTL TTL TTL TTL TTL TTL X X X X X X X X X TTL TTL TTL TTL TTL TTL TTL X D1 A V.11 V.11 V.11 V.11 V.28 V.11 V.28 Z V.11 V.11 V.11 V.11 V.28 V.11 V.28 Z B V.11 V.11 V.11 V.11 Z V.11 Z Z V.11 V.11 V.11 V.11 Z V.11 Z Z A V.11 V.10 V.11 V.11 V.28 V.11 V.28 Z V.11 V.10 V.11 V.11 V.28 V.11 V.28 Z D2 B V.11 Z V.11 V.11 Z V.11 Z Z V.11 Z V.11 V.11 Z V.11 Z Z A Z Z Z Z Z Z Z Z V.11 V.11 V.11 V.11 V.28 V.11 V.28 Z D3 B Z Z Z Z Z Z Z Z V.11 V.11 V.11 V.11 Z V.11 Z Z V.10 V.10 V.10 V.10 V.28 V.10 V.28 Z V.10 V.10 V.10 V.10 V.28 V.10 V.28 Z (Note 4) D4A D5A 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 M1 M0 DCE /DTE 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 (Note 2) R1 A B V.11 V.11 V.11 V.11 V.28 V.11 V.28 30k 30k 30k 30k 30k 30k 30k 30k 30k V.11 V.11 V.11 V.11 30k V.11 30k 30k 30k 30k 30k 30k 30k 30k 30k 30k (Note 2) R2 A B V.11 V.10 V.11 V.11 V.28 V.11 V.28 30k V.11 V.10 V.11 V.11 V.28 V.11 V.28 30k V.11 30k V.11 V.11 30k V.11 30k 30k V.11 30k V.11 V.11 30k V.11 30k 30k (Note 2) R3 A B V.11 V.11 V.11 V.11 V.28 V.11 V.28 30k V.11 V.11 V.11 V.11 V.28 V.11 V.28 30k V.11 V.11 V.11 V.11 30k V.11 30k 30k V.11 V.11 V.11 V.11 30k V.11 30k 30k (Note 2) (Note 3) (Note 5) (Note 3) (Note 5) R4A R1 R2, R3 R5A R4, R5 V.10 V.10 V.10 V.10 V.28 V.10 V.28 30k V.10 V.10 V.10 V.10 V.28 V.10 V.28 30k CMOS CMOS CMOS CMOS CMOS CMOS CMOS Z Z Z Z Z Z Z Z Z CMOS CMOS CMOS CMOS CMOS CMOS CMOS Z CMOS CMOS CMOS CMOS CMOS CMOS CMOS Z 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
sn2845 2845fs
W
LTC2845
SWITCHI G TI E WAVEFOR S
3V D 0V VO B-A -VO A VO B t SKEW t SKEW
2845 F05
1.5V t PLH 50% tr 90% 10%
f = 1MHz : t r 10ns : t f 10ns
1/2 VO
Figure 5. V.11 Driver Propagation Delays
VOD2 B-A -VOD2 VOH R VOL
0V t PLH 1.65V
Figure 6. V.11 Receiver Propagation Delays
3V D 0V VO A -VO tf 1.5V t PHL 3V 0V -3V -3V tr 0V 1.5V t PLH 3V
2845 F07
Figure 7. V.10, V.28 Driver Propagation Delays
VIH A VIL VOH R VOL RECEIVER THRESHOLD t PHL 1.65V RECEIVER THRESHOLD t PLH 1.65V
2845 F08
Figure 8. V.10, V.28 Receiver Propagation Delays
W
W
U
1.5V t PHL
VDIFF = V(B) - V(A)
90% tf
50%
10%
f = 1MHz : t r 10ns : t f 10ns
INPUT
0V t PHL
OUTPUT
1.65V
2845 F06
sn2845 2845fs
9
LTC2845
APPLICATIONS INFORMATION
Overview The LTC2846/LTC2845 or LTC2847/LTC2845 form the core of a complete software-selectable DTE or DCE interface port that supports the RS232, RS449, EIA530, EIA530A, V.35, V.36 or X.21 protocols. Cable termination is provided on-chip, eliminating the need for discrete designs. A complete DCE-to-DTE interface operating in EIA530 mode is shown in Figure 9. The LTC2846 of each port is used to generate the clock and data signals. The LTC2845 is used to generate the control signals along with LL (Local Loop-Back), RL (Remote Loop-Back), TM (Test Mode) and RI (Ring Indicate). Cable termination is used only for the clock and data signals because they must support V.11 cable termination. The control signals do not need any external resistors.
DCE
LTC2846 TXD 103 R3 SERIAL CONTROLLER TXD
DTE
SERIAL CONTROLLER TXD D1 LTC2846
SCTE
D2
D3
TXC
R1
103
RXC
R2
103
RXD
R3
103
LTC2845 RTS D1 RTS
DTR
D2
D3
DCD
R1
DSR
R2
CTS
R3
LL TM RI RL
D4 R4 R5 D5
Figure 9. Complete Multiprotocol Interface in EIA530 Mode
sn2845 2845fs
10
U
W
U
U
SCTE
103
R2
SCTE
R1
TXC
D3
TXC
RXC
D2
RXC
RXD
D1
RXD
LTC2845 R3 RTS
DTR
R2
DTR
R1
DCD
D3
DCD
DSR
D2
DSR
CTS LL TM RI RL
D1
CTS
R4 D4 D5 R5
LL TM RI RL
2845 F09
LTC2845
APPLICATIONS INFORMATION
Mode Selection The interface protocol is selected using the mode select pins M0, M1 and M2 (see the Mode Selection table). For example, if the port is configured as a V.35 interface, the mode selection pins should be M2 = 1, M1 = 0, M0 = 0. For the control signals, the drivers and receivers will operate in V.28 (RS232) electrical mode. For the clock and data signals, the drivers and receivers will operate in V.35 electrical mode. The DCE/DTE pin will configure the port for DCE mode when high, and DTE when low. The interface protocol may be selected simply by plugging the appropriate interface cable into the connector. The mode pins are routed to the connector and are left unconnected (1) or wired to ground (0) in the cable as shown in Figure 10. The internal pull-up current sources will ensure a binary 1 when a pin is left unconnected and that the LTC2846/ LTC2845 enters the no-cable mode when the cable is removed. In the no-cable mode the LTC2846/LTC2845 supply current drops to less than 1000A and all driver outputs are forced into a high impedance state. The mode selection may also be accomplished by using jumpers to connect the mode pins to ground or VIN.
(DATA) M0 LTC2846 M1 M2 DCE/DTE NC NC
DCE/DTE M2 M1 LTC2845 M0 D4ENB R4EN (DATA) 3.3k
Figure 10. Single Port DCE V.35 Mode Selection in the Cable
sn2845 2845fs
U
W
U
U
Cable Termination Traditional implementations have included switching resistors with expensive relays, or required the user to change termination modules every time the interface standard has changed. Custom cables have been used with the termination in the cable head or separate terminations are built on the board and a custom cable routes the signals to the appropriate termination. Switching the termination with FETs is difficult because the FETs must remain off even though the signal voltage is beyond the supply voltage for the FET drivers or the power is off. Using the LTC2846/LTC2845 solves the cable termination switching problem. Via software control, appropriate termination for the V.10 (RS423), V.11 (RS422), V.28 (RS232) and V.35 electrical protocols is chosen. V.10 (RS423) Interface A typical V.10 unbalanced interface is shown in Figure 11. A V.10 single-ended generator output A with ground C is connected to a differential receiver with inputs A' connected to A, and input C' connected to the signal return ground C. Usually, no cable termination is required for V.10 interfaces, but the receiver inputs must be compliant with the impedance curve shown in Figure 12.
CONNECTOR
VIN
CABLE
2845 F10
11
LTC2845
APPLICATIONS INFORMATION
The V.10 receiver configuration in the LTC2845 is shown in Figure 13. In V.10 mode switch S3 inside the LTC2845 is turned off. The noninverting input is disconnected inside the LTC2845 receiver and connected to ground.The cable termination is then the 30k input impedance to ground of the LTC2845 V.10 receiver.
GENERATOR BALANCED INTERCONNECTING CABLE LOAD CABLE TERMINATION A A' RECEIVER
C
C'
Figure 11. Typical V.10 Interface
IZ
-10V
-3V VZ 3V 10V
-3.25mA
Figure 12. V.10 Receiver Input Impedance
A' R1 51.5 LTC2845 R8 6k S3 R5 20k R6 10k RECEIVER R2 51.5 R4 20k R7 10k S1 S2 R3 124 R8 6k S3 R5 20k R6 10k RECEIVER LTC2846
A'
B'
R4 20k
R7 10k
C'
GND
2845 F13
Figure 13. V.10 Receiver Configuration
12
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W
U
U
V.11 (RS422) Interface A typical V.11 balanced interface is shown in Figure 14. A V.11 differential generator with outputs A and B with ground C is connected to a differential receiver with ground C', inputs A' connected to A, B' connected to B. The V.11 interface has a differential termination at the receiver end that has a minimum value of 100. The termination resistor is optional in the V.11 specification, but for the high speed clock and data lines, the termination is required to prevent reflections from corrupting the data. The receiver inputs must also be compliant with the impedance curve shown in Figure 12. In V.11 mode, all switches are off except S1 of the LTC2846's receivers which connects a 103 differential termination impedance to the cable as shown in Figure 151. The LTC2845 only handles control signals, so no termination other than its V.11 receivers' 30k input impedance is necessary.
GENERATOR BALANCED INTERCONNECTING CABLE LOAD CABLE TERMINATION A A' 100 MIN RECEIVER
2845 F11
3.25mA
B C
B' C'
2845 F14
2845 F12
Figure 14. Typical V.11 Interface
B' C'
GND
2845 F15
Figure 15. V.11 Receiver Configuration
1Actually, there is no switch S1 in receivers R2 and R3. However, for simplicity, all termination networks on the LTC2846 can be treated identically if it is assumed that an S1 switch exists and is always closed on the R2 and R3 receivers.
sn2845 2845fs
LTC2845
APPLICATIONS INFORMATION
V.28 (RS232) Interface A typical V.28 unbalanced interface is shown in Figure 16. A V.28 single-ended generator output A with ground C is connected to a single-ended receiver with input A' connected to A, ground C' connected via the signal return ground C. In V.28 mode, all switches are off except S3 inside the LTC2846/LTC2845 which connects a 6k (R8) impedance to ground in parallel with 20k (R5) plus 10k (R6) for a combined impedance of 5k as shown in Figure 17. The noninverting input is disconnected inside the LTC2846/ LTC2845 receiver and connected to a TTL level reference voltage for a 1.4V receiver trip point. V.35 Interface A typical V.35 balanced interface is shown in Figure 18. A V.35 differential generator with outputs A and B with ground C is connected to a differential receiver with ground C', inputs A' connected to A, B' connected to B. The V.35 interface requires a T or delta network termination at the receiver end and the generator end. The receiver differential impedance measured at the connector must be 100 10, and the impedance between shorted terminals (A' and B') and ground C' must be 150 15. In V.35 mode, both switches S1 and S2 inside the LTC2846 are on, connecting the T network impedance as shown in Figure 19. The 30k input impedance of the receiver is placed in parallel with the T network termination, but does not affect the overall input impedance significantly. The generator differential impedance must be 50 to 150 and the impedance between shorted terminals (A and B) and ground C must be 150 15. For the generator termination, switches S1 and S2 are both on as shown in Figure 20.
BALANCED INTERCONNECTING CABLE
GENERATOR
BALANCED INTERCONNECTING CABLE
LOAD CABLE TERMINATION
RECEIVER
A
A'
C
C'
Figure 16. Typical V.28 Interface
A' R8 6k S3 R5 20k R6 10k
LTC2845
RECEIVER S1 S2 R3 124 S3
B'
R4 20k
R7 10k B'
C'
GND
2845 F17
Figure 17. V.28 Receiver Configuration
U
W
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U
GENERATOR
LOAD CABLE TERMINATION RECEIVER
A 50
A' 50
125
125
50 B
2845 F16
50 B' C'
2845 F18
C
Figure 18. Typical V.35 Interface
A' R1 51.5 R8 6k R5 20k R6 10k
LTC2846
RECEIVER
R2 51.5
R4 20k
R7 10k
C'
GND
2845 F19
Figure 19. V.35 Receiver Configuration
sn2845 2845fs
13
LTC2845
APPLICATIONS INFORMATION
LTC2846 51.5 S1 S2 51.5 B C
2845 F20
A
V.35 DRIVER 124
Figure 20. V.35 Driver
No-Cable Mode The no-cable mode (M0 = M1 = M2 = D4ENB = 1, R4EN = 0) is intended for the case when the cable is disconnected from the connector. The bias circuitry, drivers and receivers are turned off, the driver outputs are forced into a high impedance state, and the supply current drops to less than 700A. LTC2846 and LTC2847 Supplies The LTC2846 and LTC2847 use an internal capacitive charge pump to generate VDD and VEE as shown in Figure 21. A voltage doubler generates about 8V on VDD and a voltage inverter generates about - 7.5V for VEE. Three 1F surface mounted tantalum or ceramic capacitors are required for C1, C2 and C3. The VEE capacitor C4 should be a minimum of 3.3F. All capacitors are 16V and should be placed as close as possible to the LTC2846 to reduce EMI. The LTC2846 has an internal boost switching regulator which generates a 5V output from the 3.3V supply as shown in Figure 22. The 5V VCC supplies its internal charge pump and transceivers as well as its companion chip. The LTC2847 requires an external 5V supply. Receiver Fail-Safe All LTC2846/LTC2845 receivers feature fail-safe operation in all modes. If the receiver inputs are left floating or shorted together by a termination resistor, the receiver output will always be forced to a logic high.
C3 1F C1 1F VDD C1+ C1- VCC C5 10F
2845 F21
C2 + LTC2846 OR LTC2847 C2 - VEE GND
C2 1F
C4 3.3F
5V
Figure 21. Charge Pump
14
U
+
W
U
U
DTE vs DCE Operation The DCE/DTE pin acts as an enable for Driver 3/Receiver 1 in the LTC2846, and Driver 3/Receiver 1 in the LTC2845. The LTC2846/LTC2845 can be configured for either DTE or DCE operation in one of two ways: a dedicated DTE or DCE port with a connector of appropriate gender, or a port with one connector that can be configured for DTE or DCE operation by rerouting the signals to the LTC2846/LTC2845 using a dedicated DTE cable or dedicated DCE cable. A dedicated DTE port using a DB-25 male connector is shown in Figure 23. The interface mode is selected by logic outputs from the controller or from jumpers to either VIN or GND on the mode select pins. A dedicated DCE port using a DB-25 female connector is shown in Figure 24. A port with one DB-25 connector, can be configured for either DTE or DCE operation is shown in Figure 25. The configuration requires separate cables for proper signal routing in DTE or DCE operation. For example, in DTE mode, the TXD signal is routed to Pins 2 and 14 via Driver 1 in the LTC2846. In DCE mode, Driver 1 now routes the RXD signal to Pins 2 and 14. Compliance Testing The LTC2846/LTC2845 chipset has been tested by TUV Rheinland of North America Inc. and passed the NET1, NET2 and TBR2 requirements. Copies of the test report are available from LTC or TUV Rheinland of North America Inc. The title of the report is Test Report No.TBR2/050101/02 The address of TUV Rheinland of North America Inc. is: TUV Rheinland of North America Inc. 1775, Old Highway 8 NW, Suite 107 St. Paul, MN 55112 Tel. (651) 639-0775 Fax (651) 639-0873
VIN 3.3V C6 10F VIN L1 5.6H D1 VCC 5V 480mA R1 13k C5 10F R2 4.3k
SHDN
SW BOOST SWITCHING REGULATOR SHDN FB GND
C1,C2: TAIYO YUDEN X5R JMK316BJ106ML D1: ON SEMICONDUCTOR MBR0520 L1: SUMIDA CR43-5R6
2845 F22
Figure 22. LTC2846 Boost Switching Regulator
sn2845 2845fs
LTC2845
TYPICAL APPLICATIONS
L1 5.6H VIN 3.3V C6 10F SHDN VDD 8V C3 1F VCC 5V LTC2846 TXD D1 T D1 MBR0520 R1 13k R2 4.3k C2 1F C1 1F CHARGE PUMP VEE -7.5V C4 3.3F C5 10F VCC 5V
SCTE
D2
T
D3
T 15 TXC A (114) TXC B RXC A (115) RXC B RXD A (104) RXD B SG SHIELD DB-25 MALE CONNECTOR 4
TXC
R1
RXC
R2
T
RXD M0 M1 M2
R3
T VIN 3.3V
DCE/DTE
C7 1F
VCC C8 1F RTS VDD D1
VEE GND
DTR
D2
D3 LTC2845 DCD R1 R2 8 10 6 DSR 22 5 CTS LL RI R3 D4 R4 13 18 *
TM RL M0 M1 M2 M0 M1 M2
R5 D5 VIN D4ENB R4EN NC C10 1F VIN 3.3V
DCE/DTE
Figure 23. Controller-Selectable Multiprotocol DTE Port with DB-25 Connector
sn2845 2845fs
+
U
BOOST SWITCHING REGULATOR
2
TXD A (103)
14 TXD B 24 SCTE A (113) 11 SCTE B
12 17 9 3 16 7
1
C9 1F 19 20 23
RTS A (105) RTS B DTR A (108) DTR B
DCD A (109) DCD B DSR A (107) DSR B CTS A (106) CTS B LL (141) RI (125)
25 21
TM (142) RL (140)
*OPTIONAL
2845 F23
15
LTC2845
TYPICAL APPLICATIONS
L1 5.6H VIN 3.3V C6 10F SHDN VDD 8V C3 1F VCC 5V LTC2846 RXD D1 T D1 MBR0520 R1 13k R2 4.3k C2 1F C1 1F CHARGE PUMP VEE -7.5V C4 3.3F C5 10F VCC 5V
RXC
D2
T
D3
T 15 TXC A (114) TXC B SCTE A (113) SCTE B TXD A (103) TXD B SG (102) SHIELD (101) DB-25 FEMALE CONNECTOR 5
TXC
R1
SCTE
R2
T
TXD M0 M1 M2 NC
R3
T VIN 3.3V
DCE/DTE
C7 1F
VCC C8 1F CTS VDD D1
VEE GND
DSR
D2
D3 LTC2845 DCD R1 R2 8 10 20 DTR 23 4 RTS RI LL R3 D4 R4 19 * 18
RL TM M0 M1 M2 NC M0 M1 M2
R5 D5 VIN D4ENB R4EN NC C10 1F VIN 3.3V
DCE/DTE
Figure 24. Controller-Selectable DCE Port with DB-25 Connector
sn2845 2845fs
16
+
U
BOOST SWITCHING REGULATOR
2
RXD A (104)
14 RXD B 24 RXC A (115)B 11 RXC B
12 24 11 2 14 7
1
C9 1F 13 6 22
CTS A (106) CTS B DSR A (107) DSR B
DCD A (109) DCD B DTR A (108) DTR B RTS A (105) RTS B RI (125) LL (141)
21 25
RL (140) TM (142)
*OPTIONAL
2845 F24
LTC2845
TYPICAL APPLICATIONS
L1 5.6H VIN 3.3V C6 10F SHDN VDD 8V C3 1F VCC 5V LTC2846 DTE_TXD/DCE_RXD D1 T D1 MBR0520 R1 13k R2 4.3k C2 1F C1 1F CHARGE PUMP VEE -7.5V C4 3.3F DTE 2 14 24 DTE_SCTE/DCE_RXC D2 T 11 TXD A TXD B SCTE A SCTE B DCE RXD A RXD B RXC A RXC B C5 10F VCC 5V
D3
T 15 TXC A TXC B RXC A RXC B RXD A RXD B SG SHIELD DB-25 CONNECTOR 4 TXC A TXC B SCTE A SCTE B TXD A TXD B
DTE_TXC/DCE_TXC
R1
DTE_RXC/DCE_SCTE
R2
T
DTE_RXD/DCE_TXD M0 M1 M2
R3
T VIN 3.3V
DCE/DTE
C7 1F
VCC C8 1F DTE_RTS/DCE_CTS VDD D1
VEE GND
DTE_DTR/DCE_DSR
D2
D3 LTC2845 DTE_DCD/DCE_DCD R1 R2 8 10 6 DTE_DSR/DCE_DTR 22 5 DTE_CTS/DCE_RTS DTE_LL/DCE_RI DTE_RI/DCE_LL R3 D4 R4 13 18 *
DTE_TM/DCE_RL DTE_RL/DCE_TM M0 M1 M2 DCE/DTE M0 M1 M2
R5 D5 VIN D4ENB R4EN NC C10 1F VIN 3.3V
DCE/DTE
Figure 25. Controller-Selectable Multiprotocol DTE/DCE Port with DB-25 Connector
sn2845 2845fs
+
U
BOOST SWITCHING REGULATOR
12 17 9 3 16 7
1
C9 1F 19 20 23
RTS A RTS B DTR A DTR B
CTS A CTS B DSR A DSR B
DCD A DCD B DSR A DSR B CTS A CTS B LL RI
DCD A DCD B DTR A DTR B RTS A RTS B RI LL
25 21
TM RL
RL TM
*OPTIONAL
2845 F25
17
LTC2845
PACKAGE DESCRIPTION
G Package 36-Lead Plastic SSOP (5.3mm)
(Reference LTC DWG # 05-08-1640)
12.50 - 13.10* (.492 - .516) 1.25 0.12 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19
7.8 - 8.2
0.42 0.03 RECOMMENDED SOLDER PAD LAYOUT 5.00 - 5.60** (.197 - .221)
0.09 - 0.25 (.0035 - .010)
0.55 - 0.95 (.022 - .037)
NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN (INCHES) 3. DRAWING NOT TO SCALE *DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED .152mm (.006") PER SIDE **DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED .254mm (.010") PER SIDE
18
U
5.3 - 5.7 7.40 - 8.20 (.291 - .323)
0.65 BSC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 2.0 (.079)
0 - 8
0.65 (.0256) BSC
0.22 - 0.38 (.009 - .015)
0.05 (.002)
G36 SSOP 0802
sn2845 2845fs
LTC2845
PACKAGE DESCRIPTIO U
UHF Package 38-Lead Plastic QFN (5mm x 7mm)
(Reference LTC DWG # 05-08-1701)
0.70 0.05 PACKAGE OUTLINE 0.25 0.05 0.50 BSC 5.20 0.05 (2 SIDES) 6.10 0.05 (2 SIDES) 7.50 0.05 (2 SIDES) RECOMMENDED SOLDER PAD LAYOUT 5.00 0.10 (2 SIDES) 0.75 0.05 0.00 - 0.05 3.15 0.10 (2 SIDES) 0.435 0.18 0.18 37 38 1 2 0.23 5.15 0.10 (2 SIDES) 0.40 0.10 0.200 REF 0.25 0.05 0.75 0.05 0.200 REF 0.00 - 0.05 0.50 BSC R = 0.115 TYP
(UH) QFN 0303
5.50 0.05 (2 SIDES) 4.10 0.05 (2 SIDES) 3.20 0.05 (2 SIDES)
PIN 1 TOP MARK (SEE NOTE 6)
7.00 0.10 (2 SIDES)
BOTTOM VIEW--EXPOSED PAD
NOTE: 1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE M0-220 VARIATION WHKD 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.20mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE
sn2845 2845fs
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
19
LTC2845
TYPICAL APPLICATIO
RL TM RI LL CTS DSR
DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
DCD DTR RTS RXD RXC TXC SCTE TXD
D5 R5 R4
D4
R3
R2
21
RL A (140)
25
TM A (142)
*
RI A (125)
18 13 5
LL A (141) CTS B CTS A (106)
10 8
DSR B DSR A (109)
RELATED PARTS
PART NUMBER
LTC1321 LTC1334 LTC1343 LTC1344A LTC1345 LTC1346A LTC1543 LTC1544 LTC1545 LTC1546 LTC2844 LTC2846
DESCRIPTION
Dual RS232/RS485 Transceiver Single 5V RS232/RS485 Multiprotocol Transceiver Software-Selectable Multiprotocol Transceiver Software-Selectable Cable Terminator Single Supply V.35 Transceiver Dual Supply V.35 Transceiver Software-Selectable Multiprotocol Transceiver Software-Selectable Multiprotocol Transceiver Software-Selectable Multiprotocol Transceiver Software-Selectable Multiprotocol Transceiver 3.3V Software-Selectable Multiprotocol Transceiver 3.3V Software-Selectable Multiprotocol Transceiver
LTC2847
Software-Selectable Multiprotocol Transceiver with 3.3V Digital Interface
20
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
U
LTC2845 D3 R1 D2 D1 R3 R2 R1 LTC2846 D3 D2 D1 T T T T T 22 6
DCD B DCD A (107)
23 20 19 4
DTR B DTR A (108) RTS B RTS A (105) SHIELD (101)
1
SG (102)
7
16
RXD B
3
RXD A (104)
9
RXC B
17
RXC A (115)
12
TXC B TXC A (114)
15 11
SCTE B SCTE A (113)
24 14
TXD B
2
TXD A (103)
*OPTIONAL
DB-25 CONNECTOR
2845 TA01
COMMENTS
Two RS232 Driver/Receiver Pairs or Two RS485 Driver/Receiver Pairs Two RS232 Driver/Receiver or Four RS232 Driver/Receiver Pairs 4-Driver/4-Receiver for Data and Clock Signals Perfect for Terminating the LTC1543 (Not Needed with LTC1546) 3-Driver/3-Receiver for Data and Clock Signals 3-Driver/3-Receiver for Data and Clock Signals Terminated with LTC1344A for Data and Clock Signals, Companion to LTC1544 or LTC1545 for Control Signals Companion to LTC1546 or LTC1543 for Control Signals Including LL 5-Driver/5-Receiver Companion to LTC1546 or LTC1543 for Control Signals Including LL, TM and RL 3-Driver/3-Receiver with Termination for Data and Clock Signals 3.3V Supply, 4-Driver/4-Receiver Companion to LTC2846 for Control Signals Including LL 3.3V Supply, 3-Driver/3-Receiver with Termination for Data and Clock Signals, Generates the Required 5V and 8V Supplies for LTC2846 and Companion Parts 3-Driver/3-Receiver with Termination for Data and Clock Signals. Seperate Supply for Digital Interface Works Down to 3.3V
sn2845 2845fs LT/TP 0703 1K * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2002

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