© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
FST3D125 • Rev. 1.0.3 4
FSTD3125 — 4-Bit Bus Switch with Level Shifting
DC Electrical Characteristics
Typical values are at VCC = 5.0V and TA = 25°C.
Symbol Parameter Condition VCC (V) TA=-40 to +85°C Unit
Min. Typ. Max.
VIK Clamp Diode Voltage IIN = -18mA 4.5 -1.2 V
VIH High-Level Input Voltage 4.5 to 5.5 2.0 V
VOH High-Level Figure 5, Figure 6, and
Figure 7 4.0 to 5.5 V
VIL Low-Level Input Voltage 4.5 to 5.5 0.8 V
IIN Input Leakage Current 0 ≤ VIN ≤ 5.5V 5.5 ±1.0 µA
VIN = 5.5V 0 10 µA
IOZ Off-state Leakage Current 0 ≤ A, B ≤ VCC 5.5 ±1.0 µA
RON Switch On Resistance(3)
VIN = 0V, IIN = 64mA 4.5 4 7
Ω
VIN = 0V, IIN = 30mA 4.5 4 7
VIN = 2.4V, IIN = 15mA 4.5 35 50
ICC Quiescent Supply Current
/OE1 = /OE2 = GND
VIN = VCC or GND,
IOUT = 0 5.5
1.5
µA
/OE1 = /OE2 = VCC
VIN = VCC or GND,
IOUT = 0 10
ΔICC Increase in ICC per Input One Input at 3.4V, Other
Inputs at VCC or GND 5.5 2.5 mA
Note:
3. Measured by the voltage drop between the A and B pins at the indicated current through the switch. On
resistance is determined by the lower of the voltages on the A or B pins.
AC Electrical Characteristics
TA = -40 to +85°C, CL = 50pF, and RU = RD = 500Ω.
Symbol Parameter Condition
VCC = 4.5 – 5.5V Unit Figure
Min. Max.
tPHL, tPLH Propagation Delay, Bus-to-Bus(4) V
IN = Open 0.25 ns Figure 3
Figure 4
tPZH ,tPZL Output Enable Time VIN = 7V for tPZL
VIN = Open for tPZH 1.0 6.1 ns
Figure 3
Figure 4
tPHZ, tPLZ Output Disable Time VIN = 7V for tPLZ
VIN = Open for tPHZ 1.5 6.4 ns
Figure 3
Figure 4
Note:
4. 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 50pF load capacitance when driven by an
ideal voltage source (zero output impedance).
Capacitance
TA = +25°C, f = 1MHz. Capacitance is characterized, but not tested.
Symbol Parameter Condition Typ. Unit
CIN Control Pin Input Capacitance VCC = 5.0V 3 pF
CI/O Input/Output Capacitance VCC, /OE = 5.0V 6 pF