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IT8687R
I/O Buffer Chip
Preliminary Specification V0.6
10. 11.
IT8687R
Revision History
Note: Words in bold lettering in the revisions below indicate the changes. Document Release
Release Version 0.6
Date
3/6/98
Revision
On page 5, change the parameter name of O18 Type Buffer on Table 6-1. DC Electrical Characteristics to O12 Type Buffer. On page 5, change the Min. of VIH of ISH Type Buffer from 1.0 to 3.0. On page 5, change the Max. of VIL of IS Type Buffer from 0.6 to 0.7. On page 5, change the Max. of VIL of ISH Type Buffer from -1 to 0.9. On page 5, change the Conditions of VOL under O12 Type Buffer from IOL=18mA to "IOL=12mA." On page 5, change the Conditions of VOH under O12 Type Buffer from IOH=-6mA to "IOH=-4mA."
Page No.
5
5 5 5 5 5
10. 11.
IT8687R Contents
Page .........................................................................................................................1 ...........................................................................................................1 ..............................................................................................................1 .................................................................................................................2 .....................................................................................................3 ................................................................................................5
1. Features
2. General Description 3.Pin Configuration 4. Block Diagram
5. IT8687R Pin Description
6.DC Electrical Characteristics 7.AC Characteristics 8.Package Information 9.Ordering Information
............................................................................................................6 ..........................................................................................................8 ..........................................................................................................9
Tables
5-1.IT8687R Signal Names (by pin numbers in alphabetical order) 6-1.DC Electrical Characteristics 7-1.AC Characteristics Page ...............................................2 ...........................................................................................5
.........................................................................................................6
IT8687R
Preliminary V0.6 Specifications subject to Change without Notice
I/O Buffer Chip
ITPA-PN-98012 Joseph. Mar. 06
1. Features
n n n n Contains six (6) line drivers (1488)and ten (10) line receivers(1489) Supports two (2) RS-232 serial ports Very low power consumption (150mW) Supports one (1) crystal oscillator clock generator n n n Four power supply inputs:0V,5V,-12V,+12V High voltage CMOS process 48-pin SSOP package
2. General Description
IT8687R integrates six (6) line drivers, ten (10) line receivers, one ISA signal encoder, one (1) UART signal-mixing control logic, and one 24/48 MHz clock generator. The ISA signals; (1) SA12, SA13, SA14, SA15, DACK0#, DACK1#, DACK2#, DACK3#, AEN, RESET are encoded into three (3) signals -- RAD0, RAD1, RAD2. 16 UART interface signals are encoded into UIF0, UIF1, UIF2, UIF3, UIF4 to minimize the pin count and the package cost. This low power consumption chip is designed to serve as an interface between data terminal equipment and data communication equipment in conformance with the EIA standard RS-232 specifications.
3. Pin Configuration
UIF4/LTX1 UIF3/LRTS1 UIF2/LRLSD1 UIF1/LRX1 UIF0/LDTR1 GND CLKOUT X2 X1 RAD2/LDSR1 RAD1/LCTS1 RAD0/LRI1 VCC DACK3#/LRLSD2 DACK2#/LRX2 DACK1# DACK0#/LTX2 AEN/LDSR2 GND SA15/LCTS2 SA14/LRI2 SA13/LRTS2 SA12/LDTR2 RESET
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25
MODE VDD TX1 RTS1 DTR1 VSS NC RLSD1 RX1 DSR1 CTS1 RI1 RLSD2 RX2 DSR2 CTS2 RI2 NC VSS TX2 RTS2 DTR2 VDD NC
IT8687R
1
13. 14. 4. Block Diagram
IT8687R
NRTS1, NDTR1, NTX1 NRTS2, NDTR2, NTX2
RTS1# TX1, DTR1# RTS2# TX2, DTR2# Multiplexer
Line Drivers
UIF0,UIF1 UIF2,UIF3 UIF4
COM1,2 signals mixer
MODE
RX1, CTS1# DSR1#,RLSD1# RI1# RX2, CTS2# DSR2#, RLSD2# RI2#
Line Receivers
NRX1, NCTS1 NDSR1, NRLSD1 NRI1, NRX2, NCTS2 NDSR2, NRLSD2 NRI2 RESET, AEN DACK0#, DACK1# DACK2#, DACK3# SA12,SA13 SA14,SA15
RAD0,RAD1 RAD2
ISA signals encoder
X1 X2
Crystal Oscillator Amplifier
CLKOUT
2
13. 14. 5. IT8687R Pin Description Table 5-1. Signal Names (by pin numbers in alphabetical order) Pin No.
1
IT8687R
Symbol
UIF4/LTX1
I/O
IS Port 1 TX line driver input.
Description
Serial ports 1,2 signals sample clock input. The second function is Serial
2
UIF3/LRTS1
IS
Serial ports 1,2 transfer cycle indicator. The second function is Serial Port 1 RTS line driver input.
3
UIF2/LRLSD1
O18
Serial port 2 signals RLSD2, RX2, DSR2, CTS2, RI2 mixing-signal output pin. The second function is Serial Port 1 RLSD line receiver output.
4
UIF1/LRX1
O18
Serial port 1 signals RLSD1, RX1, DSR1, CTS1, RI1 mixing-signal output pin. The second function is Serial Port 1 RX line receiver output.
5
UIF0/LDTR1
IS
Serial ports 1,2 signals TX1, TX2, RTS1, RTS2, DTR1, DTR2 mixing-signal input pin. The second function is Serial Port 1 DTR line driver input.
7 8 9 10
CLKOUT X2 X1 RAD2/LDSR1
O8 O I O18
Output clock generated by the crystal oscillator Crystal oscillator output Crystal oscillator input ISA signal encoding output pin 2. The second function is Serial Port 1 DSR line receiver output.
11
RAD1/LCTS1
O18
ISA signal encoding output pin 1. The second function is Serial Port 1 CTS line receiver output.
12
RAD0/LRI1
O18
ISA signal encoding output pin 0. The second function is Serial Port 1 RI line receiver output.
14
DACK3#/ LRLSD2
I/O18
ISA DMA Acknowledge 3, active low. The second function is Serial Port 2 RLSD line receiver output.
15
DACK2#/ LRX2
I/O18
ISA DMA Acknowledge 2, active low. The second function is Serial Port 2 RX line receiver output.
16 17
DACK1# DACK0#/ LTX2
IS IS
ISA DMA Acknowledge 1, active low ISA DMA Acknowledge 0, active low. The second function is Serial Port 2 TX line driver input.
18
AEN/LDSR2
I/O18
Address Enable, active high indicates system is in DMA transfer mode. The second function is Serial Port 2 DSR line receiver output.
20
SA15/LCTS2
I/O18
ISA I/O Address 15. The second function is Serial Port 2 CTS line receiver output.
21
SA14/LRI2
I/O18
ISA I/O Address 14. The second function is Serial Port 2 RI line receiver output.
3
13. 14. Table 5-1. Signal Names (by pin numbers in alphabetical order) [cont'd] Pin No.
22
IT8687R
Symbol
SA13/LRTS2
I/O
IS
Description
ISA I/O Address 13. The second function is Serial Port 2 RTS line driver input.
23 24 27 28 29 32 33 34 35 36 37 38 39 40 41 44 45 46 48 25,31 42 6,19 13 30,43 26,47
SA12/LDTR2 RESET DTR2 RTS2 TX2 RI2 CTS2 DSR2 RX2 RLSD2 RI1 CTS1 DSR1 RX1 RLSD1 DTR1 RTS1 TX1 MODE
IS IS O16H O16H O16H ISH ISH ISH ISH ISH ISH ISH ISH ISH ISH O16H O16H O16H IS
ISA I/O Address 12. The second function is Serial Port 2 DTR line driver input. System reset, active high Serial port 2 DTR line driver output Serial port 2 RTS line driver output Serial port 2 TX line driver output Serial port 2 RI line receiver input Serial port 2 CTS line receiver input Serial port 2 DSR line receiver input Serial port 2 RX line receiver input Serial port 2 RLSD line receiver input Serial port 1 RI line receiver input Serial port 1 CTS line receiver input Serial port 1 DSR line receiver input Serial port 1 RX line receiver input Serial port 1 RLSD line receiver input Serial port 1 DTR line driver output Serial port 1 RTS line driver output Serial port 1 TX line driver output Primary function is selected when this pin is low; secondary function is selected when it is high.
NC GND VCC VSS VDD
No Connection Ground +5V power -12V power +12V power
4
13. 14. 6. DC Electrical Characteristics
Absolute Maximum Ratings Ambient Operating Temperature................0C to +70C Storage Temperature..........................-55C to +150C Supply Voltage to Ground Potential ....-0.5V to VCC+0.3V Supply Hi-Voltage to Ground Potential ......0.5V to 12V Applied Normal Output Voltage .........0.5V to VCC+0.3V Applied Normal Input Voltage ......................-0.5V to 7V Applied I/O High Voltage .........................-0.5V to +15V Power Dissipation ..........................................300mW *Comments Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to this device. These are stress ratings only. Functional operation of this device at these or any other conditions above those indicated in the operational sections of this specification is not implied or intended. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability.
IT8687R
Table 6-1. DC Electrical Characteristics Symbol
IIL IIH VIL VIH IIL IIH VOL VOH VOL VOH IIL IIH VIL VIH VOL VOH
Parameter
Input Low Leakage Input High Leakage Input Low Voltage Input High Voltage Input Low Leakage Input High Leakage Output Low Voltage Output High Voltage Output Low Voltage Output High Voltage Input Low Leakage Input High Leakage Input Low Voltage Input High Voltage Output Low Voltage Output High Voltage
Min.
Typ.
Max.
10 -10 0.7
Unit
A A V V
Conditions
VIN = 0 VIN = VCC
IS Type Buffer (VCC=5V)
3.0 10 -10 0.4 2.4 0.4 2.4 10 -10 0.9 3.0 -8 8
I Type Buffer (VCC=5V) A A V V V V A A V V V V IOL = 8 mA IOH = -4 mA VIN = 0 VIN = VCC IOL = 8mA IOH = -4mA IOL = 12 mA IOH = -4 mA VIN = -12 V VIN = +12 V
O8 Type Buffer (VCC=5V)
O12 Type Buffer (VCC=5V)
ISH Type Buffer (VDD=+12V, VSS=-12V)
O16H Type Buffer (VDD=+12V, VSS=-12V)
5
13. 14. 7. AC Characteristics Table 7-1. AC Characteristics Symbol
t1 t2 t3 t4 t5 t6 t7 t8
IT8687R
Parameter
X1 to X2 X1 to X2 RESET/DACK0-3#/AEN/SA15-12 change state to RAD0-2 RESET/DACK0-3#/AEN/SA15-12 change state to RAD0-2 UIF4 to DTR1/2, RTS1/2, TX1/2 UIF4 to DTR1/2, RTS1/2, TX1/2 UIF4 to UIF1,UIF2 UIF4 to UIF1,UIF2
Min.
Typ.
20 25 50 40 100 95 60 50
Max.
30 40 70 60 120 110 80 80
Unit
ns ns ns ns ns ns ns ns
X1 X2
t1
t2
RESET DACK0-3# AEN SA15~12 RAD0-2
t3
t4
6
13. 14.
IT8687R
~ ~
UIF4 UIF2 UIF1
t7
t8
~ ~
7
13. 14. 8. Package Information SSOP 48L Outline Dimensions unit: inches/mm
48 25 e1 ~ ~
IT8687R
HE
E
L 1 b 24
Detail F
D e1
A2
Seating Plane
D
S
y
e
A1
A
See Detail F
Symbol A A1 A2 b C D E e e1 HE L LE S y
Dimension in inches 0.110 Max. 0.004 Min. 0.090 0.005 0.010 +0.003 -0.002 0.008 +0.002 -0.002 0.625 Typ. (0.637 Max.) 0.295 0.005 0.025 0.006 0.370 NOM. 0.408 0.012 0.030 0.010 0.057 0.008 0.035 Max. 0.004 Max. 0 ~ 10
Dimension in mm 2.79 Max. 0.10 Min. 2.29 0.12 0.25 +0.08 -0.05 0.20 +0.05 -0.05 15 Typ. (16.18 Max.) 7.49 0.13 0.64 0.15 9.40 NOM. 10.36 0.31 0.76 0.26 1.45 0.20 0.89 Max. 0.10 Max. 0 ~ 10
Notes: 1. The maximum value of dimension D includes end flash. 2. Dimension E does not include resin fins. 3. Dimension e1 is for PC Board surface mount pad pitch design reference only. 4. Dimension S includes end flash.
8
C LE
13. 14. 9. Ordering Information Part No.
IT8687R
IT8687R
Package
SSOP 48L
9

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