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SN74LVCR2245 OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
SCAS581 - NOVEMBER 1996
D D D D D D D
EPICTM (Enhanced-Performance Implanted CMOS) Submicron Process Typical VOLP (Output Ground Bounce) < 0.8 V at VCC = 3.3 V, TA = 25C Typical VOHV (Output VOH Undershoot) > 2 V at VCC = 3.3 V, TA = 25C Supports Mixed-Mode Signal Operation on All Ports (5-V Input/Output Voltage With 3.3-V VCC) ESD Protection Exceeds 2000 V Per MIL-STD-883, Method 3015; Exceeds 200 V Using Machine Model (C = 200 pF, R = 0) Latch-Up Performance Exceeds 250 mA Per JEDEC Standard JESD-17 Package Options Include Plastic Small-Outline (DW), Shrink Small-Outline (DB), and Thin Shrink Small-Outline (PW) Packages
DB, DW, OR PW PACKAGE (TOP VIEW)
DIR A1 A2 A3 A4 A5 A6 A7 A8 GND
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
VCC OE B1 B2 B3 B4 B5 B6 B7 B8
description
This octal bus transceiver is designed for 2.7-V to 3.6-V VCC operation. The SN74LVCR2245 is designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the buses are effectively isolated. Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators in a mixed 3.3-V/5-V system environment. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. The SN74LVCR2245 is characterized for operation from -40C to 85C.
FUNCTION TABLE INPUTS OE L L H DIR L H X OPERATION B data to A bus A data to B bus Isolation
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. EPIC is a trademark of Texas Instruments Incorporated.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright (c) 1996, Texas Instruments Incorporated
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1
SN74LVCR2245 OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
SCAS581 - NOVEMBER 1996
logic symbol
OE DIR 19 1 G3 3 EN1 [BA] 3 EN2 [AB] 1 2 A2 A3 A4 A5 A6 A7 A8 3 4 5 6 7 8 9 17 16 15 14 13 12 11 B2 B3 B4 B5 B6 B7 B8 18 B1
A1
2
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
DIR 1 19
OE
A1
2
18
B1
To Seven Other Channels
2
POST OFFICE BOX 655303
* DALLAS, TEXAS 75265
SN74LVCR2245 OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
SCAS581 - NOVEMBER 1996
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 V to 6.5 V Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 V to 6.5 V Voltage range applied to any output in the high-impedance state, VO (see Note 1) . . . . . . . . . -0.5 V to 6.5 V Voltage range applied to any output in the high or low state, VO (see Notes 1 and 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 V to VCC + 0.5 V Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -50 mA Output clamp current, IOK (VO < 0 or VO > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA Continuous output current, IO (VO = 0 to VCC) (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mA Maximum power dissipation at TA = 55C (in still air) (see Note 3): DB package . . . . . . . . . . . . . . . . . . . 0.6 W DW package . . . . . . . . . . . . . . . . . . 1.6 W PW package . . . . . . . . . . . . . . . . . . . 0.7 W Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65C to 150C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed. 2. The value of VCC is provided in the recommended operating conditions table. 3. The maximum package power dissipation is calculated using a junction temperature of 150C and a board trace length of 750 mils. For more information, refer to the Package Thermal Considerations application note in the ABT Advanced BiCMOS Technology Data Book.
recommended operating conditions (see Note 4)
MIN VCC VIH VIL VI VO IOH IOL t/v Supply voltage High-level input voltage Low-level input voltage Input voltage Output voltage High-level High level output current Low-level Low level output current Input transition rise or fall rate High or low state 3 state VCC = 2.7 V VCC = 3 V VCC = 2.7 V VCC = 3 V 0 -40 Operating Data retention only VCC = 2.7 V to 3.6 V VCC = 2.7 V to 3.6 V 2 1.5 2 0.8 0 0 0 5.5 VCC 5.5 -8 -12 8 12 10 85 MAX 3.6 UNIT V V V V V mA mA ns/V C
TA Operating free-air temperature NOTE 4: Unused inputs must be held high or low to prevent them from floating.
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SN74LVCR2245 OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
SCAS581 - NOVEMBER 1996
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER IOH = -100 A IOH = -4 mA VOH IOH = -6 mA IOH = -8 mA IOH = -12 mA IOL = 100 A VOL IOL = 4 mA IOL = 6 mA IOL = 8 mA IOL = 12 mA II IOZ ICC ICC Ci Co Control inputs A or B ports VI = 5.5 V or GND VO = VCC or GND VO = 3.6 V or 5.5 V VI = VCC or GND, One input at VCC - 0.6 V, VI = VCC or GND VO = VCC or GND IO = 0 Other inputs at VCC or GND VCC 2.7 V to 3.6 V 2.7 V 3V 2.7 V 3V 2.7 V to 3.6 V 2.7 V 3V 2.7 V 3V 3.6 V 3.6 V 2.7 V to 3.6 V 3.6 V 2.7 V to 3.6 V 3.3 V 3.3 V 3.3 5.4 MIN VCC-0.2 2.2 2.4 2 2 0.2 0.4 0.55 0.6 0.8 5 10 50 10 500 A A A A pF pF V V TYP MAX UNIT
All typical values are at VCC = 3.3 V, TA = 25C. For I/O ports, the parameter IOZ includes the input leakage current.
switching characteristics over recommended operating free-air temperature range, CL = 50 pF (unless otherwise noted) (see Figure 1)
PARAMETER tpd ten tdis tsk(o) FROM (INPUT) A or B OE OE TO (OUTPUT) B or A A or B A or B VCC = 3.3 V 0.3 V MIN 1.5 1.5 1.5 MAX 7.5 9.5 7.5 1 VCC = 2.7 V MIN MAX 8.5 10.5 8.5 ns ns ns ns UNIT
Skew between any two outputs of the same package switching in the same direction. This parameter is warranted but not production tested.
operating characteristics, VCC = 3.3 V, TA = 25C
PARAMETER Cpd d Power dissipation capacitance per transceiver Outputs enabled Outputs disabled TEST CONDITIONS CL = 50 pF pF, f = 10 MHz TYP 33 2 UNIT pF
4
POST OFFICE BOX 655303
* DALLAS, TEXAS 75265
SN74LVCR2245 OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
SCAS581 - NOVEMBER 1996
PARAMETER MEASUREMENT INFORMATION
6V From Output Under Test CL = 50 pF (see Note A) 500 S1 Open GND 500 TEST tpd tPLZ/tPZL tPHZ/tPZH S1 Open 6V GND
LOAD CIRCUIT Timing Input tw 2.7 V Input 1.5 V 1.5 V 0V VOLTAGE WAVEFORMS PULSE DURATION Data Input tsu 1.5 V
2.7 V 1.5 V 0V th 2.7 V 1.5 V 0V VOLTAGE WAVEFORMS SETUP AND HOLD TIMES 2.7 V 1.5 V tPZL VOH Output Waveform 1 S1 at 6 V (see Note B) Output Waveform 2 S1 at GND (see Note B) tPZH tPLZ 1.5 V tPHZ VOH - 0.3 V VOH 3V VOL + 0.3 V VOL 1.5 V 0V
2.7 V Input tPLH Output 1.5 V 1.5 V 1.5 V 0V tPHL 1.5 V VOL tPHL Output 1.5 V tPLH VOH 1.5 V VOL VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES INVERTING AND NONINVERTING OUTPUTS
Output Control
1.5 V
[0V
VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES LOW- AND HIGH-LEVEL ENABLING
NOTES: A. CL includes probe and jig capacitance. B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. C. All input pulses are supplied by generators having the following characteristics: PRR 10 MHz, ZO = 50 , tr 2.5 ns, tf 2.5 ns. D. The outputs are measured one at a time with one transition per measurement. E. tPZL and tPZH are the same as ten. F. tPLZ and tPHZ are the same as tdis. G. tPLH and tPHL are the same as tpd.
Figure 1. Load Circuit and Voltage Waveforms
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