74HCT257N NXP Semiconductors, 74HCT257N Datasheet - Page 6

• Manufacturer Part Number: 74HCT257N
• Description: IC, 74HCT CMOS, 74HCT257, DIP16, 5V
• Manufacturer: NXP Semiconductors

Specifications of 74HCT257N

• Logic Type: Multiplexer
• No. Of Outputs: 4
• Supply Voltage Range: 4.5V To 5.5V
• Logic Case Style: DIP
• No. Of Pins: 16
• Operating Temperature Range: -40°C To +125°C
• Svhc: No SVHC (18-Jun-2010)
• Package: RoHS Compliant
• Base Number: 74
• Rohs Compliant: Yes

Philips Semiconductors
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see
Output capability: bus driver
I
Note to HCT types
The value of additional quiescent supply current ( I
To determine I
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
1998 Sep 30
CC
INPUT
nI
nI
OE
S
SYMBOL
t
t
t
t
t
PHL
PHL
PZH
PHZ
THL
Quad 2-input multiplexer; 3-state
0
1
category: MSI
/ t
/ t
/ t
/ t
/ t
TLH
PLH
PLH
PZL
PLZ
PARAMETER
propagation delay
propagation delay
3-state output enable time
3-state output disable time
output transition time
r
S to nY
OE to nY
OE to nY
nI
nI
= t
UNIT LOAD COEFFICIENT
0.40
0.40
1.35
0.70
0
1
CC
f
to nY
to nY
= 6 ns; C
per input, multiply this value by the unit load coefficient shown in the table below.
L
= 50 pF
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
min.
16
20
15
16
5
typ.
25
CC
30
35
30
30
12
) for a unit load of 1 is given in the family specifications.
max. min.
6
T
74HCT
amb
40 to 85
( C)
38
44
38
38
15
max.
min.
40 to 125
45
53
45
45
18
max.
.
ns
ns
ns
ns
ns
UNIT
74HC/HCT257
TEST CONDITIONS
4.5
4.5
4.5
4.5
4.5
V
Product specification
(V)
CC
Fig.6
Fig.6
Fig.7
Fig.7
Fig.6
WAVEFORMS