SN74LVCH32245A_13 Datasheet, PDF (1/13 Pages) Texas Instruments – 32-BIT BUS TRANSCEIVER

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FEATURES
• Member of the Texas Instruments Widebus+™
Family
• Operates From 1.65 V to 3.6 V
• Inputs Accept Voltages to 5.5 V
• Max t_pd of 4 ns at 3.3 V
• Typical V_OLP (Output Ground Bounce)
<0.8 V at V_CC = 3.3 V, T_A = 25°C
• Typical V_OHV (Output V_OH Undershoot)
>2 V at V_CC = 3.3 V, T_A = 25°C
• I_off Supports Partial-Power-Down Mode
Operation
SN74LVCH32245A
32-BIT BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCAS616H – OCTOBER 1998 – REVISED MARCH 2005
• Supports Mixed-Mode Signal Operation on
All Ports (5-V Input/Output Voltage With
3.3-V V_CC)
• Bus Hold on Data Inputs Eliminates the Need
for External Pullup/Pulldown Resistors
• Other Products to Consider: SN74LVC32245
• Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
• ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
DESCRIPTION/ORDERING INFORMATION
This 32-bit (quad-octal) noninverting bus transceiver is designed for 1.65-V to 3.6-V V_CC operation.
The SN74LVCH32245A is designed for asynchronous communication between data buses. The control-function
implementation minimizes external timing requirements.
This device can be used as four 8-bit transceivers, two 16-bit transceivers, or one 32-bit transceiver. It allows
data transmission from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the
direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so that the buses
effectively are isolated.
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators
in a mixed 3.3-V/5-V system environment.
This device is fully specified for partial-power-down applications using I_off. The I_off circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
To ensure the high-impedance state during power up or power down, OE should be tied to V_CC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup or
pulldown resistors with the bus-hold circuitry is not recommended. The bus-hold circuitry is part of the input
circuit and is not disabled by OE or DIR.
T_A
–40°C to 85°C
ORDERING INFORMATION
PACKAGE ⁽¹⁾
ORDERABLE PART NUMBER
LFBGA – GKE
LFBGA – ZKE (Pb-free)
Tape and reel
SN74LVCH32245AGKER
SN74LVCH32245AZKER
TOP-SIDE MARKING
CH245A
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
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.
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.
Copyright © 1998–2005, Texas Instruments Incorporated