SN74CBT3257C Datasheet, PDF (7/19 Pages) Texas Instruments – 4-BIT 1-OF-2 FET MULTIPLEXER/DEMULTIPLEXER 5-V BUS SWITCH WITH -2-V UNDERSHOOT PROTECTION

SN74CBT3257C
4ĆBIT 1ĆOFĆ2 FET MULTIPLEXER/DEMULTIPLEXER
5ĆV BUS SWITCH WITH ć2ĆV UNDERSHOOT PROTECTION
SCDS137 − OCTOBER 2003
PARAMETER MEASUREMENT INFORMATION
Input Generator
VG1
50 Ω
Input Generator
VG2
50 Ω
VIN
50 Ω
VI
50 Ω
VCC
DUT
TEST CIRCUIT
VO
CL
(see Note A)
7V
RL
S1
Open
GND
RL
TEST
tpd(s)
tPLZ/tPZL
tPHZ/tPZH
VCC
5 V ± 0.5 V
4V
5 V ± 0.5 V
4V
5 V ± 0.5 V
4V
S1
Open
Open
7V
7V
Open
Open
RL
500 Ω
500 Ω
500 Ω
500 Ω
500 Ω
500 Ω
VI
VCC or GND
VCC or GND
GND
GND
VCC
VCC
CL
50 pF
50 pF
50 pF
50 pF
50 pF
50 pF
V_∆
0.3 V
0.3 V
0.3 V
0.3 V
Output
Control
(VIN)
1.5 V
3V
1.5 V
0V
Output
Control
(VIN)
1.5 V
3V
1.5 V
0V
tPLH
tPHL
Output
1.5 V
1.5 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES (tpd(s))
VOH
VOL
Output
Waveform 1
S1 at 7 V
(see Note B)
tPZL
tPZH
Output
Waveform 2
S1 at Open
(see Note B)
1.5 V
1.5 V
tPLZ
3.5 V
VOL + V_∆
VOL
tPHZ
VOH
VOH − V_∆
0V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns.
D. The outputs are measured one at a time with one transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd(s). The tpd propagation delay is the calculated RC time constant of the typical ON-state
resistance of the switch and the specified load capacitance, when driven by an ideal voltage source (zero output impedance).
H. All parameters and waveforms are not applicable to all devices.
Figure 3. Test Circuit and Voltage Waveforms
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