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參數(shù)資料
| 型號(hào)： | 933784330623 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 總線收發(fā)器 |
| 英文描述： | F/FAST SERIES, OCTAL 1-BIT TRANSCEIVER, INVERTED OUTPUT, PDSO20 |
| 封裝： | PLASTIC, SOL-20 |
| 文件頁(yè)數(shù)： | 4/11頁(yè) |
| 文件大?。?/td> | 94K |
| 代理商： | 933784330623 |
Philips Semiconductors
Product specification
74F640
Octal bus transceiver, inverting (3-State)
2
1989 Nov 27
853–0381 98171
FEATURES
High-impedance NPN base inputs for reduced loading
(70
A in High and Low states)
Ideal for applications which require high-output drive and minimal
bus loading
Inverting version of 74F245
Octal bidirectional bus interface
3-State outputs sink 64mA and source 15mA
DESCRIPTION
The 74F640 is an octal transceiver featuring inverting 3-State bus
compatible outputs in both transmit and receive directions. The B
port outputs are capable of sinking 64mA and sourcing 15mA,
providing very good capacitive drive characteristics. The device
features an Output Enable (OE) input for easy cascading and
Transmit/Receiver (T/R) input for direction control. The 3-State
outputs, B0–B7, have been designed to prevent output bus loading if
the power is removed from the device.
PIN CONFIGURATION
SF00198
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
T/R
A0
A1
A2
A3
A4
A5
A6
A7
GND
VCC
OE
B0
B1
B2
B3
B4
B6
B5
B7
TYPE
TYPICAL
PROPAGATION
DELAY
TYPICAL SUPPLY CURRENT
(TOTAL)
74F640
3.5ns
78mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
VCC = 5V ±10%,
Tamb = 0°C to +70°C
PKG DWG #
20-pin plastic DIP
N74F640N
SOT146-1
20-pin plastic SOL
N74F640D
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
3.5/0.115
70
A/70A
OE
Output Enable input (active Low)
2.0/0.067
40
A/40A
T/R
Transmit/Receive input
2.0/0.067
40
A/40A
A0 - A7
A port outputs
150/40
3.0mA/24mA
B0 - B7
B port outputs
750/106.7
15mA/64mA
NOTE: One (1.0) FAST unit load is defined as: 20
A in the High state and 0.6mA in the Low state.
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