Datasheet

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Electrical Characteristics
(1)
Switching Characteristics
SN74CB3Q3245
8-BIT FET BUS SWITCH
2.5-V/3.3-V LOW-VOLTAGE HIGH-BANDWIDTH BUS SWITCH
SCDS124B – JULY 2003 – REVISED MARCH 2005
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP
(2)
MAX UNIT
V
IK
V
CC
= 3.6 V, I
I
= –18 mA –1.8 V
I
IN
Control inputs V
CC
= 3.6 V, V
IN
= 0 to 5.5 V ± 1 µ A
V
O
= 0 to 5.5 V, Switch OFF,
I
OZ
(3)
V
CC
= 3.6 V, ± 1 µ A
V
I
= 0, V
IN
= V
CC
or GND
I
off
V
CC
= 0, V
O
= 0 to 5.5 V, V
I
= 0 1 µ A
I
I/O
= 0,
I
CC
V
CC
= 3.6 V, V
IN
= V
CC
or GND 1 2 mA
Switch ON or OFF,
∆ I
CC
(4)
Control inputs V
CC
= 3.6 V, One input at 3 V, Other inputs at V
CC
or GND 30 µ A
V
CC
= 3.6 V, A and B ports open,
Per control mA/
I
CCD
(5)
0.30 0.35
input MHz
Control input switching at 50% duty cycle
C
in
Control inputs V
CC
= 3.3 V, V
IN
= 5.5 V, 3.3 V, or 0 2.5 3.5 pF
Switch OFF,
C
io(OFF)
V
CC
= 3.3 V, V
I/O
= 5.5 V, 3.3 V, or 0 3.5 5 pF
V
IN
= V
CC
or GND,
Switch ON,
C
io(ON)
V
CC
= 3.3 V, V
I/O
= 5.5 V, 3.3 V, or 0 9 11 pF
V
IN
= V
CC
or GND,
V
I
= 0, I
O
= 30 mA 4 8
V
CC
= 2.3 V,
TYP at V
CC
= 2.5 V
V
I
= 1.7 V, I
O
= –15 mA 4.5 9
r
on
(6)
Ω
V
I
= 0, I
O
= 30 mA 4 6
V
CC
= 3 V
V
I
= 2.4 V, I
O
= –15 mA 4 8
(1) V
IN
and I
IN
refer to control inputs. V
I
, V
O
, I
I
, and I
O
refer to data pins.
(2) All typical values are at V
CC
= 3.3 V (unless otherwise noted), T
A
= 25 ° C.
(3) For I/O ports, the parameter I
OZ
includes the input leakage current.
(4) This is the increase in supply current for each input that is at the specified TTL voltage level, rather than V
CC
or GND.
(5) This parameter specifies the dynamic power-supply current associated with the operating frequency of a single control input (see
Figure 2 ).
(6) Measured by the voltage drop between the A and 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.
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 3 )
V
CC
= 2.5 V V
CC
= 3.3 V
FROM TO
± 0.2 V ± 0.3 V
PARAMETER UNIT
(INPUT) (OUTPUT)
MIN MAX MIN MAX
f
OE
(1)
OE A or B 10 20 MHz
t
pd
(2)
A or B B or A 0.12 0.20 ns
t
en
OE A or B 1.5 7.5 1.5 6.5 ns
t
dis
OE A or B 1 6.5 1 6.5 ns
(1) Maximum switching frequency for control input (V
O
> V
CC
, V
I
= 5 V, R
L
≥ 1 M Ω , C
L
= 0)
(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).
5