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| 74HC648 Datasheet, PDF (8/12 Pages) NXP Semiconductors – Octal bus transceiver/register; 3-state; inverting | |||
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Philips Semiconductors
Octal bus transceiver/register; 3-state;
inverting
Product speciï¬cation
74HC/HCT648
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
SYMBOL PARAMETER
74HCT
+25
â40 to +85
UNIT
â40 to +125
VCC
(V)
WAVEFORMS
min. typ. max. min. max. min. max.
tPHL/ tPLH propagation delay
An, Bn to Bn, An
14 27
34
41 ns 4.5 Fig.6
tPHL/ tPLH propagation delay
25 46
58
69 ns 4.5 Fig.7
CPAB, CPBA to Bn, An
tPHL/ tPLH propagation delay
SAB, SBA to Bn, An
20 38
48
57 ns 4.5 Fig.8
tPZH/ tPZL 3-state output enable
21 40
50
60 ns 4.5 Fig.9
time
OE to An, Bn
tPHZ/ tPLZ 3-state output disable
20 35
44
53 ns 4.5 Fig.9
time
OE to An, Bn
tPZH/ tPZL 3-state output enable
20 40
50
60 ns 4.5 Fig.10
time
DIR to An, Bn
tPHZ/ tPLZ 3-state output disable
21 35
44
53 ns 4.5 Fig.10
time
DIR to An, Bn
tTHL/ tTLH output transition time
5 12
15
18 ns 4.5 Fig.6 and Fig.8
tW
clock pulse width
16 7
HIGH or LOW
CPAB or CPBA
tsu
set-up time
12 2
An, Bn to CPAB, CPBA
th
hold time
50
An, Bn to CPAB, CPBA
fmax
maximum clock pulse 30 80
frequency
20
24
15
18
5
5
24
20
ns 4.5 Fig.7
ns 4.5 Fig.7
ns 4.5 Fig.7
ns MHz Fig.7
December 1990
8
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