SN74CBT3245C
8 BIT FET BUS SWITCH
5 V BUS SWITCH WITH 2 V UNDERSHOOT PROTECTION
SCDS131A − SEPTEMBER 2003 − REVISED OCTOBER 2003
D
Undershoot Protection for Off-Isolation on
D
D
D
D
D
D
D
A and B Ports Up To −2 V
Bidirectional Data Flow, With Near-Zero
Propagation Delay
Low ON-State Resistance (r
on
)
Characteristics (r
on
= 3
Ω
Typical)
Low Input/Output Capacitance Minimizes
Loading and Signal Distortion
(C
io(OFF)
= 5.5 pF Typical)
Data and Control Inputs Provide
Undershoot Clamp Diodes
Low Power Consumption
(I
CC
= 3
µA
Max)
V
CC
Operating Range From 4 V to 5.5 V
Data I/Os Support 0 to 5-V Signaling Levels
(0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, 5-V)
DB, DBQ, DGV, DW, OR PW PACKAGE
(TOP VIEW)
D
Control Inputs Can Be Driven by TTL or
D
D
D
5-V/3.3-V CMOS Outputs
I
off
Supports Partial-Power-Down Mode
Operation
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
ESD Performance Tested Per JESD 22
− 2000-V Human-Body Model
(A114-B, Class II)
− 1000-V Charged-Device Model (C101)
Supports Both Digital and Analog
Applications: USB Interface, Memory
Interleaving, Bus Isolation, Low-Distortion
Signal Gating
D
RGY PACKAGE
(TOP VIEW)
NC
A1
A2
A3
A4
A5
A6
A7
A8
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
OE
B1
B2
B3
B4
B5
B6
B7
B8
1
20
19
OE
18
B1
17
B2
16
B3
15
B4
14
B5
13
B6
12
B7
A1
A2
A3
A4
A5
A6
A7
A8
2
3
4
5
6
7
8
9
10
11
NC − No internal connection
NC − No internal connection
description/ordering information
The SN74CBT3245C is a high-speed TTL-compatible FET bus switch with low ON-state resistance (r
on
),
allowing for minimal propagation delay. Active Undershoot-Protection Circuitry on the A and B ports of the
SN74CBT3245C provides protection for undershoot up to −2 V by sensing an undershoot event and ensuring
that the switch remains in the proper OFF state.
The SN74CBT3245C is organized as an 8-bit bus switch with a single output-enable (OE) input. When OE is
low, the bus switch is ON, and the A port is connected to the B port, allowing bidirectional data flow between
ports. When OE is high, the bus switch is OFF, and the high-impedance state exists between the A and B ports.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
2003, Texas Instruments Incorporated
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
GND
B8
V
CC
NC
1
TI [ TEXAS INSTRUMENTS ]
