SN74LVCH245 Datasheet, PDF (1/7 Pages) Texas Instruments – OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS

D EPIC ™ (Enhanced-Performance Implanted
CMOS) Submicron Process
D Typical V_OLP (Output Ground Bounce)
< 0.8 V at V_CC = 3.3 V, T_A = 25°C
D Typical V_OHV (Output V_OH Undershoot)
> 2 V at V_CC = 3.3 V, T_A = 25°C
D ESD Protection Exceeds 2000 V Per
MIL-STD-833C, Method 3015; Exceeds
200 V Using Machine Model
(C = 200 pF, R = 0)
D Latch-Up Performance Exceeds 250 mA
Per JEDEC Standard JESD-17
D Supports Mixed-Mode Signal Operation on
All Ports (5-V Input/Output Voltages With
3.3-V V_CC)
D Bus Hold on Data Inputs Eliminates the
Need for External Pullup Resistors
D Package Options Include Shrink
Small-Outline (DB), Plastic Small-Outline
(DW), and Thin Shrink Small-Outline (PW)
Packages
SN74LVCH245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCES008 – JULY 1995
DB, DW, OR PW PACKAGE
(TOP VIEW)
DIR 1
A1 2
A2 3
A3 4
A4 5
A5 6
A6 7
A7 8
A8 9
GND ¹⁰
20 V_CC
19 OE
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 _B8
description
This octal bus transceiver is designed for 2.7-V to 3.6-V V_CC operation; it can interface to a 5-V system
environment.
The SN74LVCH245 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 upon 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.
To ensure the high-impedance state during power up or power down, OE should be tied to V_CC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
The SN74LVCH245 is characterized for operation from – 40°C to 85°C.
FUNCTION TABLE
INPUTS
OE DIR
OPERATION
L
L
B data to A bus
L
H A data to B bus
H
X
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 © 1995, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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