SN74LVCH16244A_16 Datasheet, PDF (13/26 Pages) Texas Instruments – SN74LVCH16244A 16-Bit Buffer/Driver With 3-State Outputs

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SN74LVCH16244A
SCES494B – OCTOBER 2003 – REVISED JUNE 2014
10 Application and Implementation
10.1 Application Information
The SN74LVCH16244A device is a 16-bit buffer driver. This device can be used as four 4-bit, two 8-bit, or one
16-bit buffer. It allows data transmission from the A bus to the Y bus with 4 separate enable pins that control 4
bits each. The output-enable (OE) input can be used to disable sections of the device so that the buses are
effectively isolated. The device has 5.5 V tolerant inputs at any valid V_CC. This allows the device to be used in
multi-power systems, and it can be used for down translation. Active bus-hold circuitry holds unused or undriven
inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended.
10.2 Typical Application
Regulated 3.6 V
uC or
System Logic
OE
Vcc
DIR
1A1
1Y1
1A4
1Y4
GND
uC
System Logic
LEDs
Figure 4. Typical Application Diagram
10.2.1 Design Requirements
This device uses CMOS technology and has balanced output drive. Care should be taken to avoid bus
contention because it can drive currents that would exceed maximum limits. The high drive will also create fast
edges into light loads; therefore, routing and load conditions should be considered to prevent ringing.
10.2.2 Detailed Design Procedure
1. Recommended Input Conditions
– Rise time and fall time specs: See (Δt/ΔV) in the Recommended Operating Conditions table.
– Specified high and low levels: See (V_IH and V_IL) in the Recommended Operating Conditions table.
– Inputs are overvoltage tolerant allowing them to go as high as 5.5 V at any valid V_CC.
2. Recommend Output Conditions
– Load currents should not exceed 25 mA per output and 50 mA total for the part.
– Outputs should not be pulled above V_CC.
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