SN74CB3T16212

Features:

` Member of the Texas Instruments Widebus™Family
` Output Voltage Translation Tracks V_CC
` 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<sub>CC</sub>
5-V/3.3-V Input Down to 2.5-V Output Level Shift With 2.5-V V<sub>CC</sub>
` 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_on) Characteristics (r_on = 5 W Typ)
` Low Input/Output Capacitance Minimizes Loading (C<sub>io(OFF</sub>) = 9 pF Typ)
` Data and Control Inputs Provide Undershoot Clamp Diodes
` Low Power Consumption (I<sub>CC</sub> = 70 mA Max)
` V_CC Operating Range From 2.3 V to 3.6 V
` 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
` Ioff Supports Partial-Power-Down Mode 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


Pinout




Specifications

			MIN	MAX	UNIT
VCC	Supply voltage range		0.5	7	V
VIN	Control input voltage range(2) (3)		0.5	7	V
VI/O	Switch I/O voltage range(2) (3) (4)		0.5	7	V
IIK	Control input clamp current	VIN < 0		50	mA
II/OK	I/O port clamp current	VI/O < 0		50	mA
IIO	ON-state switch current(5)			±128	mA
	Continuous current through VCC or GND			±100	mA
qJA	Package thermal impedance(6)	DGG package		64	°C/W
		DGV package		48
		GQL/ZQLpackage		42
Tstg	Storage temperature range		65	150	°C

Description

   The SN74CB3T16212 is a high-speed TTL-compatible FET bus-exchange switch, with low ON-state resistance (r_on), allowing for minimal propagation delay. The device fully supports mixed-mode signal operation on all data I/O ports by providing voltage translation that tracks V_CC. The SN74CB3T16212 supports systems using 5-V TTL, 3.3-V LVTTL, and 2.5-V CMOS switching standards, as well as user-defined switching levels (see Figure 1).

   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 SN74CB3T16212 device is fully specified for partial-power-down applications using I_off. The I_off feature ensures that damaging current will not backflow through the device when it is powered down. The device has isolation during power off.

   To ensure the SN74CB3T16212 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.