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參數(shù)資料
| 型號(hào)： | 74F545SCX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Single 8-bit Bus Transceiver |
| 中文描述： | F/FAST SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO20 |
| 封裝： | 0.300 INCH, MS-013, SOIC-20 |
| 文件頁(yè)數(shù)： | 2/10頁(yè) |
| 文件大?。?/td> | 84K |
| 代理商： | 74F545SCX |
Philips Semiconductors
Product specification
74F545
Octal bidirectional transceiver (with 3-State inputs/outputs)
2
1990 Mar 01
853–0375 98992
FEATURES
High impedance NPN base inputs for reduced loading
(70
μ
A 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
20
19
18
17
16
15
14
13
12
10
11
9
8
7
6
5
4
3
2
1
V
CC
B0
B1
B4
B5
B6
B7
A0
A1
A4
A5
A7
OE
GND
B2
B3
A3
A2
SF01032
A6
T/R
TYPE
TYPICAL
PROPAGATION DELAY
TYPICAL SUPPLY
CURRENT
(TOTAL)
74F545
4.0ns
87mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL
RANGE
V
CC
= 5V
±
10%,
T
amb
= 0
°
C to +70
°
C
PKG DWG #
20-Pin Plastic DIP
N74F545N
SOT146-1
20-Pin Plastic SOL
N74F545D
SOT163-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74F(U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
A0–A7, B0–B7
Data inputs
3.5/0.117
70
μ
A/70
μ
A
OE
Output Enable input (active Low)
2.0/0.067
40
μ
A/40
μ
A
T/R
Transmit/Receive input
2.0/0.067
40
μ
A/40
μ
A
A0 - A7
Port A 3-State outputs
150/40
3.0mA/24mA
B0 - B7
NOTE:
One (1.0) FAST Unit Load is defined as: 20
μ
A in the High state and 0.6mA in the Low state.
Port B 3-State outputs
750/107
15mA/64mA
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