74F545 Datasheet, PDF (2/10 Pages) NXP Semiconductors – Octal bidirectional transceiver with 3-State inputs/outputs

Philips Semiconductors
Product specification
Octal bidirectional transceiver (with 3-State inputs/outputs)
74F545
FEATURES
• High impedance NPN base inputs for reduced loading
(70µA in High and Low states) output
• 8-bit bidirectional data flow reduces system package count
• 3-State inputs/outputs for interfacing with bus oriented systems
• 24mA and 64mA bus drive capability on A and B ports,
respectively
• Transmit/Receive and Output Enable simplify control logic
DESCRIPTION
The 74F545 is an 8-bit, 3-State, high speed transceiver. It provides
bidirectional drive for the bus-oriented microprocessor and digital
communications systems. Straight through bidirectional transceivers
are featured, with 24mA bus drive capability on the A ports and
64mA bus drive capability on the B ports. One input,
Transmit/Receive (T/R) determines the direction of logic signals
through the bidirectional transceiver. Transmit enables data from A
ports to B ports; Receive enables data from B ports to A ports. The
Output Enable input disables both A and B ports by placing them in
a 3-State condition. The 74F545 performs the same function as the
74F245, the only difference being package pin assignment.
PIN CONFIGURATION
A0 1
A1 2
A2 3
A3 4
A4 5
A5 6
A6 7
A7 8
OE 9
GND 10
20 VCC
19 B0
18 B1
17 B2
16 B3
15 B4
14 B5
13 _B6
12 _B7
11 _T/R
SF01032
TYPE
TYPICAL
PROPAGATION DELAY
74F545
4.0ns
TYPICAL SUPPLY
CURRENT
(TOTAL)
87mA
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic DIP
COMMERCIAL
RANGE
V_CC = 5V ±10%,
T_amb = 0°C to +70°C
N74F545N
PKG DWG #
SOT146-1
20-Pin Plastic SOL
N74F545D
SOT163-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74F(U.L.)
HIGH/LOW
A0–A7, B0–B7
Data inputs
3.5/0.117
OE
Output Enable input (active Low)
2.0/0.067
T/R
Transmit/Receive input
2.0/0.067
A0 - A7
Port A 3-State outputs
150/40
B0 - B7
Port B 3-State outputs
NOTE: One (1.0) FAST Unit Load is defined as: 20µA in the High state and 0.6mA in the Low state.
750/107
LOAD VALUE
HIGH/LOW
70µA/70µA
40µA/40µA
40µA/40µA
3.0mA/24mA
15mA/64mA
1990 Mar 01
2
853–0375 98992