TEXAS INSTRUMENTS SN74CB3T16212 Technical data
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S0
1A1
1A2
2A1
2A2
3A1
3A2
GND
4A1
4A2
5A1
5A2
6A1
6A2
7A1
7A2
V
CC
8A1
GND
8A2
9A1
9A2
10A1
10A2
11A1
11A2
12A1
12A2
S1
S2
1B1
1B2
2B1
2B2
3B1
GND
3B2
4B1
4B2
5B1
5B2
6B1
6B2
7B1
7B2
8B1
GND
8B2
9B1
9B2
10B1
10B2
11B1
11B2
12B1
12B2
DGG OR DGV PACKAGE
(TOP VIEW)
查询74CB3T16212DGGRE4供应商
FEATURES
• Member of the Texas Instruments Widebus™
Family
• Output Voltage Translation Tracks V
• Supports Mixed-Mode Signal Operation on All
Data I/O Ports
– 5-V Input Down to 3.3-V Output Level Shift
With 3.3-V V
– 5-V/3.3-V Input Down to 2.5-V Output Level
Shift With 2.5-V V
• 5-V-Tolerant I/Os With Device Powered Up or
Powered Down
• Bidirectional Data Flow, With Near-Zero
Propagation Delay
• Low ON-State Resistance (r
(r
on
• Low Input/Output Capacitance Minimizes
Loading (C
• Data and Control Inputs Provide Undershoot
Clamp Diodes
• Low Power Consumption (I
• V
CC
• Data I/Os Support 0-V 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)
• Control Inputs Can Be Driven by TTL or
5-V/3.3-V CMOS Outputs
• I
off
Operation
• Latch-Up Performance Exceeds 250 mA Per
JESD 17
• ESD Performance Tested Per JESD 22
– 2000-V Human-Body Model(A114-B, Class II)
– 1000-V Charged-Device Model (C101)
• Supports Digital Applications: Level
Translation, PCI Interface, USB Interface,
Memory Interleaving, and Bus Isolation
• Ideal for Low-Power Portable Equipment
DESCRIPTION/ORDERING INFORMATION
The SN74CB3T16212 is a high-speed TTL-compatible FET bus-exchange switch, with low ON-state resistance
(r
), allowing for minimal propagation delay. The device fully supports mixed-mode signal operation on all data
on
I/O ports by providing voltage translation that tracks V
3.3-V LVTTL, and 2.5-V CMOS switching standards, as well as user-defined switching levels (see Figure 1).
Widebus is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
24-BIT FET BUS-EXCHANGE SWITCH, 2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH
WITH 5-V-TOLERANT LEVEL SHIFTER
SCDS157A – OCTOBER 2003 – REVISED FEBRUARY 2005
CC
CC
CC
) Characteristics
= 5 Ω Typ)
= 9 pF Typ)
io(OFF)
Operating Range From 2.3 V to 3.6 V
Supports Partial-Power-Down Mode
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.
on
= 70 µ A Max)
CC
. The SN74CB3T16212 supports systems using 5-V TTL,
CC
Copyright © 2003–2005, Texas Instruments Incorporated
SN74CB3T16212
www.ti.com
V
CC
V
CC
5.5 V
0 V
Input Voltages Output Voltages
0 V
VCC − 1 V VCC − 1 V
V
CC
IN OUT
CB3T
NOTE: If the input high-voltage (VIH) level is greater than or equal to VCC − 1 V and less than or equal to 5.5 V , the
output high-voltage (VOH) level is equal to approximately the VCC voltage level.
SN74CB3T16212
24-BIT FET BUS-EXCHANGE SWITCH, 2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH
WITH 5-V-TOLERANT LEVEL SHIFTER
SCDS157A – OCTOBER 2003 – REVISED FEBRUARY 2005
Figure 1. Typical DC Voltage Translation Characteristics
The SN74CB3T16212 operates as a 24-bit bus switch or as a 12-bit bus exchange that provides data
exchanging between four signal ports. The select (S0, S1, S2) inputs control the data path of the bus-exchange
switch. When the bus-exchange switch is ON, the A port is connected to the B port, allowing bidirectional data
flow between ports. When the bus-exchange switch is OFF, a high-impedance state exists between the A and B
ports.
This device is fully specified for partial-power-down applications using I
current will not backflow through the device when it is powered down. The device has isolation during power off.
To ensure the high-impedance state during power up or power down, each select input should be tied to GND
through a pulldown resistor; the minimum value of the resistor is determined by the current-sourcing capability of
the driver.
off
. The I
feature ensures that damaging
off
ORDERING INFORMATION
(1)
ORDERABLE PART NUMBER TOP-SIDE MARKING
T
A
TSSOP – DGG Tape and reel SN74CB3T16212DGGR CB3T16212
–40 ° C to 85 ° C
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
TVSOP – DGV Tape and reel SN74CB3T16212DGVR KR212
VFBGA – GQL Tape and reel SN74CB3T16212GQLR
VFBGA – ZQL (Pb-free) Tape and reel SN74CB3T16212ZQLR
PACKAGE
KR212
2
www.ti.com
GQL OR ZQL PACKAGE
(TOP VIEW)
A
B
C
D
E
F
G
H
J
K
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24-BIT FET BUS-EXCHANGE SWITCH, 2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH
WITH 5-V-TOLERANT LEVEL SHIFTER
SCDS157A – OCTOBER 2003 – REVISED FEBRUARY 2005
TERMINAL ASSIGNMENTS
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A 1A2 1A1 S0 S1 S2 1B1
B 3A1 2A2 2A1 1B2 2B1 2B2
C 4A1 GND 3A2 3B1 GND 3B2
D 5A2 4A2 5A1 4B2 4B1 5B1
E 6A2 6A1 5B2 6B1
F 7A1 7A2 7B1 6B2
G V
H 8A2 9A1 9A2 9B2 9B1 8B2
J 10A1 10A2 11A1 11B1 10B2 10B1
K 11A2 12A1 12A2 12B2 12B1 11B2
CC
GND 8A1 8B1 GND 7B2
SN74CB3T16212
FUNCTION TABLE
INPUTS INPUTS/OUTPUTS
S2 S1 S0 A1 A2
L L L Z Z Disconnect
L L H B1 port Z A1 port = B1 port
L H L B2 port Z A1 port = B2 port
L H H Z B1 port A2 port = B1 port
H L L Z B2 port A2 port = B2 port
H L H Z Z Disconnect
H H L B1 port B2 port
H H H B2 port B1 port
FUNCTION
A1 port = B1 port
A2 port = B2 port
A1 port = B2 port
A2 port = B1 port
3
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12B2
12B1
1B2
1B1
12A2
12A1
1A2
1A1
S0
S1
S2
SW
SW
SW
SW
SW
SW
SW
SW
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53
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56
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SN74CB3T16212
24-BIT FET BUS-EXCHANGE SWITCH, 2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH
WITH 5-V-TOLERANT LEVEL SHIFTER
SCDS157A – OCTOBER 2003 – REVISED FEBRUARY 2005
LOGIC DIAGRAM (POSITIVE LOGIC)
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