74HC643 Datasheet, PDF (5/6 Pages) NXP Semiconductors – Octal bus transceiver; 3-state; true/inverting

Philips Semiconductors
Octal bus transceiver; 3-state;
true/inverting
Product specification
74HC/HCT643
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
I_CC category: MSI
Note to HCT types
The value of additional quiescent supply current (∆I_CC) for a unit load of 1 is given in the family specifications.
To determine ∆I_CC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT
A_n
B_n
OE
DIR
UNIT LOAD COEFFICIENT
1.50
0.40
1.50
0.90
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t_r = t_f = 6 ns; C_L = 50 pF
T_amb (°C)
TEST CONDITIONS
SYMBOL
PARAMETER
74HCT
+25
−40 to +85
−40 to +125
UNIT
V_CC
(V)
WAVEFORMS
min. typ. max. min. max. min. max.
t_PHL/ t_PLH propagation delay
A_n to B_n;
inverting
10 20
25
30 ns 4.5 Fig.5
t_PHL/ t_PLH propagation delay
B_n to A_n;
non-inverting (true)
13 23
29
35 ns 4.5 Fig.6
t_PZH/ t_PZL 3-state output enable time
16 30
38
45 ns 4.5 Fig.7
OE, DIR to A_n;
OE, DIR to B_n
t_PHZ/ t_PLZ 3-state output disable time
17 30
38
45 ns 4.5 Fig.7
OE, DIR to A_n;
OE, DIR to B_n
t_THL/ t_TLH output transition time
5 12
15
18 ns 4.5 Fig.5 and Fig.6
December 1990
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