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74LCX245 Datasheet PDF - Motorola

Part Number 74LCX245
Description LOW-VOLTAGE CMOS OCTAL TRANSCEIVER
Manufacturers Motorola 
Logo Motorola Logo 

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74LCX245 datasheet, circuit
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Low-Voltage CMOS Octal
Transceiver
With 5V-Tolerant Inputs and Outputs
(3-State, Non-Inverting)
The MC74LCX245 is a high performance, non–inverting octal
transceiver operating from a 2.7 to 3.6V supply. High impedance TTL
compatible inputs significantly reduce current loading to input drivers
while TTL compatible outputs offer improved switching noise
performance. A VI specification of 5.5V allows MC74LCX245 inputs to be
safely driven from 5V devices. The MC74LCX245 is suitable for memory
address driving and all TTL level bus oriented transceiver applications.
Current drive capability is 24mA at both A and B ports. The
Transmit/Receive (T/R) input determines the direction of data flow
through the bi–directional transceiver. Transmit (active–HIGH) enables
data from A ports to B ports; Receive (active–LOW) enables data from B
to A ports. The Output Enable input, when HIGH, disables both A and B
ports by placing them in a HIGH Z condition.
Designed for 2.7 to 3.6V VCC Operation
5V Tolerant — Interface Capability With 5V TTL Logic
Supports Live Insertion and Withdrawal
IOFF Specification Guarantees High Impedance When VCC = 0V
LVTTL Compatible
LVCMOS Compatible
24mA Balanced Output Sink and Source Capability
Near Zero Static Supply Current in All Three Logic States (10µA)
Substantially Reduces System Power Requirements
Latchup Performance Exceeds 500mA
ESD Performance: Human Body Model >2000V; Machine Model >200V
MC74LCX245
LOW–VOLTAGE CMOS
OCTAL TRANSCEIVER
20
1
20
1
20
1
20
1
DW SUFFIX
PLASTIC SOIC
CASE 751D–04
M SUFFIX
PLASTIC SOIC EIAJ
CASE 967–01
SD SUFFIX
PLASTIC SSOP
CASE 940C–03
DT SUFFIX
PLASTIC TSSOP
CASE 948E–02
Pinout: 20–Lead (Top View)
VCC OE B0 B1 B2 B3 B4 B5 B6 B7
20 19 18 17 16 15 14 13 12 11
1 2 3 4 5 6 7 8 9 10
T/R A0 A1 A2 A3 A4 A5 A6 A7 GND
9/95
© Motorola, Inc. 1996
1
PIN NAMES
Pins
Function
OE
T/R
A0–A7
B0–B7
Output Enable Input
Transmit/Receive Input
Side A 3–State Inputs or 3–State
Outputs
Side B 3–State Inputs or 3–State
Outputs
REV 3

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74LCX245 equivalent
MC74LCX245
An, Bn
Bn, An
1.5V 1.5V
tPLH
1.5V
tPHL
1.5V
WAVEFORM 1 – PROPAGATION DELAYS
tR = tF = 2.5ns, 10% to 90%; f = 1MHz; tW = 500ns
2.7V
0V
VOH
VOL
OE, T/R
An, Bn
An, Bn
PULSE
GENERATOR
1.5V 1.5V
tPZH tPHZ
1.5V
tPZL tPLZ
1.5V
2.7V
0V
VCC
VOH – 0.3V
0V
3.0V
VOL + 0.3V
GND
WAVEFORM 2 – OUTPUT ENABLE AND DISABLE TIMES
tR = tF = 2.5ns, 10% to 90%; f = 1MHz; tW = 500ns
Figure 1. AC Waveforms
VCC
DUT
RT
R1
CL RL
6V
OPEN
GND
LCX DATA
BR1339 — REV 3
TEST
SWITCH
tPLH, tPHL
Open
tPZL, tPLZ
6V
Open Collector/Drain tPLH and tPHL
6V
tPZH, tPHZ
GND
CL = 50pF or equivalent (Includes jig and probe capacitance)
RL = R1 = 500or equivalent
RT = ZOUT of pulse generator (typically 50)
Figure 2. Test Circuit
5
MOTOROLA

5 Page
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Information Total 8 Pages
Download[ 74LCX245.PDF Datasheet ]

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