Datasheet
74HC_HCT244 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 4 — 24 September 2012 6 of 18
NXP Semiconductors
74HC244; 74HCT244
Octal buffer/line driver; 3-state
10. Dynamic characteristics
74HCT244
V
IH
HIGH-level
input voltage
V
CC
= 4.5 V to 5.5 V 2.0 1.6 - 2.0 - 2.0 - V
V
IL
LOW-level
input voltage
V
CC
= 4.5 V to 5.5 V - 1.2 0.8 - 0.8 - 0.8 V
V
OH
HIGH-level
output voltage
V
I
=V
IH
or V
IL
; V
CC
=4.5V
I
O
= 20 A 4.4 4.5 - 4.4 - 4.4 - V
I
O
= 6 mA 3.98 4.32 - 3.84 - 3.7 - V
V
OL
LOW-level
output voltage
V
I
=V
IH
or V
IL
; V
CC
=4.5V
I
O
=20A - 0 0.1 - 0.1 - 0.1 V
I
O
= 6.0 mA - 0.16 0.26 - 0.33 - 0.4 V
I
I
input leakage
current
V
I
=V
CC
or GND;
V
CC
=5.5V
--0.1 - 1.0 - 1.0 A
I
OZ
OFF-state
output current
per input pin; V
I
=V
IH
or V
IL
;
V
O
=V
CC
or GND;
other inputs at V
CC
or GND;
V
CC
=5.5V; I
O
=0A
--0.5 - 5.0 - 10 A
I
CC
supply current V
I
=V
CC
or GND;
V
CC
=5.5V; I
O
=0A
- - 8.0 - 80 - 160 A
I
CC
additional
supply current
per input pin;
V
I
=V
CC
2.1 V;
other inputs at V
CC
or GND;
V
CC
= 4.5 V to 5.5 V;
I
O
=0A
- 70 252 - 315 - 343 A
C
I
input
capacitance
-3.5 - - - - - pF
Table 6. Static characteristics …continued
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions 25 C 40 C to +85 C 40 C to +125 C Unit
Min Typ Max Min Max Min Max
Table 7. Dynamic characteristics
GND = 0 V; for load circuit see Figure 8
.
Symbol Parameter Conditions 25 C 40 C to +125 C Unit
Min Typ Max Max
(85 C)
Max
(125 C)
74HC244
t
pd
propagation delay nAn to nYn;
see Figure 6
[1]
V
CC
= 2.0 V - 30 110 145 165 ns
V
CC
= 4.5 V - 11 22 28 33 ns
V
CC
= 5.0 V; C
L
=15pF - 9 - - - ns
V
CC
= 6.0 V - 9 19 24 28 ns