74FST3251 Datasheet, PDF (4/8 Pages) ON Semiconductor – 8:1 Multiplexer/Demultiplexer Bus Switch

74FST3251
DC ELECTRICAL CHARACTERISTICS
Symbol
Parameter
Conditions
V_CC
T_A = *40_C to )85_C
(V)
Min Typ* Max Unit
V_IK
Clamp Diode Resistance
V_IH
High–Level Input Voltage
I_IN = *18mA
4.5
4.0 to 5.5 2.0
*1.2 V
V
V_IL
I_I
I_OZ
R_ON
Low–Level Input Voltage
Input Leakage Current
OFF–STATE Leakage Current
Switch On Resistance (Note 6)
0 v V_IN v 5.5 V
0 v A, B v V_CC
V_IN = 0 V, I_IN = 64 mA
4.0 to 5.5
5.5
5.5
4.5
0.8
V
$1.0 mA
$1.0 mA
4
7
W
V_IN = 0 V, I_IN = 30 mA
4.5
4
7
V_IN = 2.4 V, I_IN = 15 mA
4.5
8
15
V_IN = 2.4 V, I_IN = 15 mA
4.0
11
20
I_CC
Quiescent Supply Current
V_IN = V_CC or GND, I_OUT = 0
5.5
3
mA
DI_CC
Increase In I_CC per Input
One input at 3.4 V, Other inputs at V_CC or GND
5.5
2.5 mA
*Typical values are at V_CC = 5.0 V and T_A = 25_C.
6. Measured by the voltage drop between A and B pins at the indicated current through the switch. On resistance is determined by the lower
of the voltages on the two (A or B) pins.
AC ELECTRICAL CHARACTERISTICS
T_A = *40_C to )85_C
C_L = 50 pF, RU = RD = 500 W
Symbol
Parameter
Conditions
V_CC = 4.5–5.5 V
Min
Max
V_CC = 4.0 V
Min
Max Unit
t_PHL, t_PLH Prop Delay Bus to Bus (Note 7)
Prop Delay, Select to Bus A
V_I = OPEN
0.25
1.0
6.3
0.25 ns
6.9
t_PZH, t_PZL Output Enable Time, Select to Bus B
V_I = 7 V for t_PZL
1.0
6.0
6.5
ns
Output Enable Time, I_OE to Bus A, B
V_I = OPEN for t_PZH
1.0
6.0
6.5
t_PHZ, t_PLZ Output Disable Time, Select to Bus B
V_I = 7 V for t_PLZ
1.0
5.8
6.5
ns
Output Disable Time, I_OE to Bus A, B
V_I = OPEN for t_PHZ
1.0
5.8
6.5
7. This parameter is guaranteed by design but is not tested. The bus switch contributes no propagation delay other than the RC delay of the
typical On resistance of the switch and the 50 pF load capacitance, when driven by an ideal voltage source (zero output impedance).
CAPACITANCE (Note 8)
Symbol
Parameter
Conditions
C_IN
Control Pin Input Capacitance
V_CC = 5.0 V
C_I/O
A Port Input/Output Capacitance
V_CC, OE = 5.0 V
C_I/O
B Port Input/Output Capacitance
V_CC, OE = 5.0 V
8. T_A = )25_C, f = 1 MHz, Capacitance is characterized but not tested.
Typ
Max Unit
3
pF
13
pF
5
pF
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