CD74AC191 Datasheet, PDF (6/10 Pages) Texas Instruments – Presettable Synchronous 4-Bit Binary Up/Down Counter

CD74AC191, CD74ACT191
Prerequisite For Switching Function (Continued)
-40^oC TO 85^oC
-55^oC TO 125^oC
PARAMETER
SYMBOL
V_CC (V)
MIN
MAX
MIN
MAX
UNITS
Set-Up Time, CE to CP
t_SU
5
9.2
-
10.5
-
ns
Set-Up Time, U/D to CP
t_SU
5
10.5
-
12
-
ns
Hold Time, Pn to PL
t_H
5
2
-
2
-
ns
Hold Time, CE to CP
t_H
5
0
-
0
-
ns
Hold Time, U/D to CP
t_H
5
0
-
0
-
ns
NOTES:
8. 3.3V Min is at 3V.
9. 5V Min is at 4.5V.
10. Applies to non-cascaded operation only. With cascaded counters clock-to-terminal count propagation delays, count enable (CE)-to-clock
set-up times, and count enable (CE)-to-clock hold times determine max clock frequency. For example, with these AC devices at 85^oC
and V_CC = 5V:.
f_MAX (CP)= _C-----_P----_---_t--_o---_---_T----_C------_p---_r--_o---_p----_.---_d---_e----_l-_a---_y-----₊-----_C-----_E----_---_t1-_o----_---_C----_P------_s---_e---_t--_u---_p-----₊-----_C-----_E----_---_t-_o---_---_C-----_P-----_H-----_o---_l-_d-- = ₁----₈---_.--₂-----+---¹--₉---_.--₂-----+----₀-- ≈ 36MHz
Switching Specifications Input t_r, t_f = 3ns, C_L = 50pF (Worst Case)
-40^oC TO 85^oC
PARAMETER
AC TYPES
SYMBOL
V_CC (V)
MIN
TYP MAX
Propagation Delay
PL to Qn
t_PLH, t_PHL
1.5
-
3.3
5.4
(Note 12)
-
171
-
19.1
5
3.9
(Note 13)
-
13.6
Propagation Delay
Pn to Qn
t_PLH, t_PHL
1.5
-
-
173
3.3
5.4
-
19.4
5
3.9
-
13.8
Propagation Delay
CP to Qn
t_PLH, t_PHL
1.5
-
-
182
3.3
5.8
-
20.4
5
4.1
-
14.5
Propagation Delay
CP to RC
t_PLH, t_PHL
1.5
-
-
136
3.3
4.3
-
15.3
5
3.1
-
11
Propagation Delay
CP to TC
t_PLH, t_PHL
1.5
-
-
227
3.3
7.2
-
25.5
5
5.2
-
18.2
Propagation Delay
U/D to RC
t_PLH, t_PHL
1.5
-
-
246
3.3
7.8
-
27.6
5
5.6
-
19.7
Propagation Delay
U/D to TC
t_PLH, t_PHL
1.5
-
-
160
3.3
5.1
-
17.9
5
3.6
-
12.8
-55^oC TO 125^oC
MIN
TYP
MAX
UNITS
-
-
188
ns
5.3
-
21
ns
3.8
-
15
ns
-
-
190
ns
5.3
-
21.3
ns
3.8
-
15.2
ns
-
-
200
ns
5.6
-
22.4
ns
4
-
16
ns
-
-
150
ns
4.2
-
16.8
ns
3
-
12
ns
-
-
250
ns
7
-
28
ns
5
-
20
ns
-
-
271
ns
7.6
-
30.4
ns
5.4
-
21.7
ns
-
-
176
ns
4.9
-
19.7
ns
3.5
-
14.1
ns
6