SN74CBT3251_15 Datasheet, PDF (5/25 Pages) Texas Instruments – FET Multiplexer and Demultiplexer

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SN74CBT3251
SCDS019M – MAY 1995 – REVISED DECEMBER 2015
6.5 Electrical Characteristics
over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V_IK
I_I
I_CC
ΔI_CC ⁽²⁾
C_i
C_io(OFF)
r_on ⁽³⁾
Control inputs
Control inputs
A port
B port
V_CC = 4.5 V, I_I = −18 mA
V_CC = 5.5 V, V_I = 5.5 V or GND
V_CC = 5.5 V, I_O = 0, V_I = VCC or GND
V_CC = 5.5 V; One input at 3.4 V, other inputs at V_CC or GND
V_I = 3 V or 0
V_O = 3 V or 0, OE = V_CC
V_O = 3 V or 0, OE = V_CC
V_CC = 4 V, TYP at V_CC = 4 V, V_I = 2.4 V, I_I = 15 mA
V_CC = 4.5 V
V_I = 0
I_I = 64 mA
I_I = 30 mA
V_I = 2.4 V, I_I = 15 mA
MIN TYP⁽¹⁾ MAX UNIT
–1.2
V
±1 µA
3 µA
2.5 mA
3.5
pF
17.5
pF
4
14
20
5
7
Ω
5
7
10
15
(1) All typical values are at V_CC = 5 V (unless otherwise noted), T_A = 25°C.
(2) This is the increase in supply current for each input at the specified TTL voltage level, rather than V_CC or GND.
(3) Measured by the voltage drop between the A and the B terminals at the indicated current through the switch. On-state resistance is
determined by the lower of the voltages of the two (A or B) terminals.
6.6 Switching Characteristics
over operating free-air temperature free-air temperature range, C_L = 50 pF (unless otherwise noted)
PARAMETER
FROM (INPUT)
TO (OUTPUT)
V_CC
MIN
t_pd ⁽¹⁾
A or B
B or A
V_CC = 4 V
V_CC = 5 V ±0.5 V
t_pd
S
A
V_CC = 4 V
V_CC = 5 V ±0.5 V
2
S
B
V_CC = 4 V
t_en
V_CC = 5 V ±0.5 V
1.5
OE
A or B
V_CC = 4 V
V_CC = 5 V ±0.5 V
1.6
S
B
V_CC = 4 V
t_dis
V_CC = 5 V ±0.5 V
1.9
OE
A or B
V_CC = 4 V
V_CC = 5 V ±0.5 V
2.3
MAX
0.35
0.24
6
5.5
6.4
5.6
6.4
5.8
6.8
6.4
6
6.2
UNIT
ns
ns
ns
ns
(1) 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).
6.7 Typical Characteristic
0.1
0.095
0.09
0.085
0.08
0.075
0.07
-45 -30 -15 0 15 30 45 60 75 90
Temperature (qC)
D001
Figure 1. I_CC Variation With Temperature
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