74HC244; 74HCT244
Philips Semiconductors
Octal buffer/line driver; 3-state
11. Dynamic characteristics
Table 9:
Dynamic characteristics 74HC244
GND = 0 V; tr = tf = 6 ns; CL = 50 pF unless otherwise specified; for test circuit see Figure 8.
Symbol Parameter
Conditions
Min
Typ
Max
Unit
Tamb = 25 °C
tPHL
tPLH
,
propagation delay nAn to nYn see Figure 6
VCC = 2.0 V
VCC = 4.5 V
-
-
-
-
30
11
9
110
22
-
ns
ns
ns
ns
VCC = 5 V; CL = 15 pF
VCC = 6.0 V
see Figure 7
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
see Figure 7
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
see Figure 6
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
VI = GND to VCC
9
19
tPZH
tPZL
,
,
3-state output enable time
nOE to nYn
-
-
-
36
13
10
150
30
ns
ns
ns
26
tPHZ
tPLZ
3-state output disable time
nOE to nYn
-
-
-
39
14
11
150
30
ns
ns
ns
26
tTHL
,
output transition time
tTLH
-
-
-
-
14
5
60
12
10
-
ns
ns
ns
pF
4
[1]
CPD
power dissipation
capacitance
35
Tamb = −40 °C to +85 °C
tPHL
tPLH
,
propagation delay nAn to nYn see Figure 6
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
-
-
-
-
-
-
145
28
ns
ns
ns
24
tPZH
tPZL
,
,
3-state output enable time
nOE to nYn
see Figure 7
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
see Figure 7
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
see Figure 6
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
-
-
-
-
-
-
190
38
ns
ns
ns
33
tPHZ
tPLZ
3-state output disable time
nOE to nYn
-
-
-
-
-
-
190
38
ns
ns
ns
33
tTHL
,
output transition time
tTLH
-
-
-
-
-
-
75
15
13
ns
ns
ns
74HC_HCT244_3
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 22 December 2005
10 of 22
NXP [ NXP ]
