74HC244 Datasheet, PDF (6/7 Pages) NXP Semiconductors – Octal buffer/line driver; 3-state

Philips Semiconductors
Octal buffer/line driver; 3-state
Product specification
74HC/HCT244
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
1A_n
2A_n
1OE
2OE
UNIT LOAD COEFFICIENT
0.70
0.70
0.70
0.70
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
1A_n to 1Y_n;
2A_n to 2Y_n
13 22
28
33 ns 4.5 Fig.5
t_PZH/ t_PZL 3-state output enable time
15 30
38
45 ns 4.5 Fig.6
1OE to 1Y_n;
2OE to 2Y_n
t_PHZ/ t_PLZ 3-state output disable time
15 25
31
38 ns 4.5 Fig.6
1OE to 1Y_n;
2OE to 2Y_n
t_THL/ t_TLH output transition time
5 12
15
18 ns 4.5 Fig.5
December 1990
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