74FST3251 데이터 시트보기 (PDF) - ON Semiconductor
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74FST3251 Datasheet PDF : 7 Pages
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74FST3251
DC ELECTRICAL CHARACTERISTICS
Symbol
Parameter
Conditions
VCC
TA = *40_C to )85_C
(V)
Min Typ* Max Unit
VIK Clamp Diode Resistance
IIN = *18mA
4.5
*1.2 V
VIH High−Level Input Voltage
4.0 to 5.5 2.0
V
VIL Low−Level Input Voltage
4.0 to 5.5
0.8
V
II
Input Leakage Current
0 v VIN v 5.5 V
5.5
$1.0 mA
IOZ OFF−STATE Leakage Current 0 v A, B v VCC
5.5
$1.0 mA
RON Switch On Resistance (Note 6) VIN = 0 V, IIN = 64 mA
4.5
4
7
W
VIN = 0 V, IIN = 30 mA
4.5
4
7
VIN = 2.4 V, IIN = 15 mA
4.5
8
15
VIN = 2.4 V, IIN = 15 mA
4.0
11
20
ICC Quiescent Supply Current
VIN = VCC or GND, IOUT = 0
5.5
3
mA
DICC Increase In ICC per Input
One input at 3.4 V, Other inputs at VCC or GND
5.5
2.5 mA
*Typical values are at VCC = 5.0 V and TA = 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
Symbol
Parameter
Conditions
TA = *40_C to )85_C
CL = 50 pF, RU = RD = 500 W
VCC = 4.5−5.5 V
VCC = 4.0 V
Min
Max
Min
Max Unit
tPHL, tPLH Prop Delay Bus to Bus (Note 7)
Prop Delay, Select to Bus A
VI = OPEN
0.25
1.0
6.3
0.25 ns
6.9
tPZH, tPZL Output Enable Time, Select to Bus B
VI = 7 V for tPZL
1.0
6.0
6.5
ns
Output Enable Time, IOE to Bus A, B
VI = OPEN for tPZH
1.0
6.0
6.5
tPHZ, tPLZ Output Disable Time, Select to Bus B
VI = 7 V for tPLZ
1.0
5.8
6.5
ns
Output Disable Time, IOE to Bus A, B
VI = OPEN for tPHZ
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
CIN Control Pin Input Capacitance
VCC = 5.0 V
CI/O A Port Input/Output Capacitance
VCC, OE = 5.0 V
CI/O B Port Input/Output Capacitance
VCC, OE = 5.0 V
8. TA = )25_C, f = 1 MHz, Capacitance is characterized but not tested.
Typ
Max Unit
3
pF
13
pF
5
pF
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