CD74AC257 Datasheet, PDF (6/8 Pages) Texas Instruments – Quad 2-Input Multiplexer with Three-State Outputs

CD74AC257, CD74ACT257, CD74ACT258
Switching Specifications Input t_r, t_f = 3ns, C_L = 50pF (Worst Case) (Continued)
-40^oC TO 85^oC
-55^oC TO 125^oC
PARAMETER
Propagation Delay,
OE to Y
CD74AC/ACT257
SYMBOL
V_CC (V)
MIN
t_PLZ, t_PHZ,
5
4.1
t_PZL, t_PZH
TYP
MAX
MIN
TYP
MAX UNITS
-
14.6
4
-
16.1
ns
Propagation Delay,
In to Y
CD74AC/ACT258
t_PLH, t_PHL
5
2.4
-
8.5
2.3
-
9.3
ns
Propagation Delay,
S to Y
CD74AC/ACT258
t_PLH, t_PHL
5
4
-
14
3.9
-
15.4
ns
Propagation Delay,
OE to Y
CD74AC/ACT258
t_PLZ, t_PHZ,
5
t_PZL, t_PZH
4.1
-
14.6
4
-
16.1
ns
Three-State Output
Capacitance
C_O
-
-
-
15
-
-
15
pF
Input Capacitance
C_I
-
Power Dissipation Capacitance
C_PD
-
(Note 11)
-
-
10
-
-
10
pF
-
130
-
-
130
-
pF
NOTES:
8. Limits tested 100%.
9. 3.3V Min is at 3.6V, Max is at 3V.
10. 5V Min is at 5.5V, Max is at 4.5V.
11. C_PD is used to determine the dynamic power consumption per multiplexer.
AC: P_D = C_PD V_CC2 f_i + ∑ (C_L V_CC2 f_o)
ACT: P_D = C_PD V_CC2 f_i + ∑ (C_L V_CC2 f_o) + V_CC ∆I_CC where f_i = input frequency, f_o = output frequency, C_L = output load capacitance,
V_CC = supply voltage.
t_r = 3ns
OUTPUT
DISABLE
t_PLZ
t_f = 3ns
t_PZL
INPUT LEVEL
90%
V_S
10%
GND
OUTPUT: LOW
TO OFF TO LOW
OUTPUT: HIGH
TO OFF TO HIGH
t_PHZ
OUTPUTS
ENABLED
OTHER
INPUTS
(TIED HIGH
OR LOW)
OUTPUT
DISABLE
DUT
WITH
THREE-
STATE
OUTPUT
t_PZH
V_S
0.2V_{CC VOL (≠GND)}
0.8 V_CC^{VOH (≠VCC)}
V_S
OUTPUTS
OUTPUTS
DISABLED
ENABLED
GND (t_PHZ, t_PZH)
OPEN (t_PHL, t_PLH)
500_Ω†
R_L
2 V_CC (t_PLZ, t_PZL)
(OPEN DRAIN)
C_L
50pF
OUT
500_Ω†
R_L
†FOR AC SERIES ONLY: WHEN V_CC = 1.5V, R_L = 1kΩ
FIGURE 1. THREE-STATE PROPAGATION DELAY TIMES AND TEST CIRCUIT
6