74HC257 查看數據表（PDF） - NXP Semiconductors.
零件编号
产品描述 (功能)
比赛名单
74HC257 Datasheet PDF : 17 Pages
| |||
NXP Semiconductors
74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
5. Pinning information
5.1 Pinning
74HC257
74HCT257
S1
1I0 2
1I1 3
1Y 4
2I0 5
2I1 6
2Y 7
GND 8
16 VCC
15 OE
14 4I0
13 4I1
12 4Y
11 3I0
10 3I1
9 3Y
001aad499
Fig 5. Pin configuration DIP16, SO16, SSOP16 and TSSOP16
5.2 Pin description
Table 2. Pin description
Symbol
Pin
S
1
1I0 to 4I0
2, 5, 11, 14
1I1 to 4I1
3, 6, 10, 13
1Y to 4Y
4, 7, 9, 12
GND
8
OE
15
VCC
16
Description
common data select input
data input from source 0
data input from source 1
3-state multiplexer output
ground (0 V)
3-state output enable input (active LOW)
supply voltage
6. Functional description
6.1 Function table
Table 3.
Control
OE
H
L
L
L
L
Function table[1]
S
X
H
H
L
L
Input
nl0
nl1
X
X
X
L
X
H
L
X
H
X
[1] H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.
Output
nY
Z
L
H
L
H
74HC_HCT257_5
Product data sheet
Rev. 05 — 13 January 2010
© NXP B.V. 2010. All rights reserved.
4 of 17
Share Link: 