SN74CBT3251 Datasheet, PDF (4/12 Pages) Texas Instruments – 1-OF-8 FET MULTIPLEXER/DEMULTIPLEXER

SN74CBT3251
1ĆOFĆ8 FET MULTIPLEXER/DEMULTIPLEXER
SCDS019L − MAY 1995 − REVISED JANUARY 2004
switching characteristics over recommended operating free-air temperature range, C_L = 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
tpd†
FROM
(INPUT)
A or B
TO
(OUTPUT)
B or A
VCC = 4 V
MIN MAX
0.35
VCC = 5 V
± 0.5 V
MIN MAX
0.25
UNIT
ns
tpd
S
A
6
2 5.5 ns
S
B
6.4 1.5 5.6
ten
ns
OE
A or B
6.4 1.6 5.8
S
B
6.8 1.9 6.4
tdis
ns
OE
A or B
6 2.3 6.2
† _{The 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).
PARAMETER MEASUREMENT INFORMATION
From Output
Under Test
CL = 50 pF
(see Note A)
500 Ω ^S1
500 Ω
7V
Open
GND
TEST
tpd
tPLZ/tPZL
tPHZ/tPZH
S1
Open
7V
Open
LOAD CIRCUIT
Output
Control
1.5 V
3V
1.5 V
0V
Input
1.5 V
3V
1.5 V
0V
tPLH
Output
1.5 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
tPHL
1.5 V
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 + 0.3 V
VOL
tPHZ
VOH
VOH − 0.3 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.
H. All parameters and waveforms are not applicable to all devices.
Figure 1. Load Circuit and Voltage Waveforms
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