Independent Registers Buses Multiplexed Real-Time Stored Data True Dat

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Independent Registers Buses Multiplexed Real-Time Stored Data True Dat

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SN54HC646, SN74HC646 OCTAL TRANSCEIVERS REGISTERS WITH 3-STATE OUTPUTS
Independent Registers Buses Multiplexed Real-Time Stored Data True Data Paths High-Current 3-State Outputs Drive LSTTL Loads Package Options Include Plastic Small-Outline (DW) Ceramic Flat Packages, Ceramic Chip Carriers (FK), Standard Plastic (NT) Ceramic (JT) 300-mil DIPs
SN54HC646 PACKAGE SN74HC646 PACKAGE (TOP VIEW)
description
'HC646 consist bus-transceiver circuits with 3-state outputs, D-type flip-flops, control circuitry arranged multiplexed transmission data directly from input from internal registers. Data clocked into registers low-to-high transition appropriate clock (CLKAB CLKBA) input. Figure illustrates four fundamental busmanagement functions that performed with 'HC646. Output-enable (OE) direction-control (DIR) inputs control transceiver functions. transceiver mode, data present high-impedance port stored either both registers. select-control (SAB SBA) inputs multiplex stored real-time (transparent mode) data. determines which receives data when active (low). isolation mode high), data stored register data stored other register.
CLKAB
CLKBA
SN54HC646 PACKAGE (TOP VIEW)
CLKAB CLKBA
internal connection
When output function disabled, input function still enabled used store transmit data. Only buses, driven time. SN54HC646 characterized operation over full military temperature range 55°C 125°C. SN74HC646 characterized operation from -40°C 85°C.
Please aware that important notice concerning availability, standard warranty, critical applications Texas Instruments semiconductor products disclaimers thereto appears this data sheet.
UNLESS OTHERWISE NOTED this document contains PRODUCTION DATA information current publication date. Products conform specifications terms Texas Instruments standard warranty. Production processing does necessarily include testing parameters. POST OFFICE 655303
Copyright 1997, Texas Instruments Incorporated
DALLAS, TEXAS 75265
SN54HC646, SN74HC646 OCTAL TRANSCEIVERS REGISTERS WITH 3-STATE OUTPUTS
CLKAB CLKBA
CLKAB
CLKBA
REAL-TIME TRANSFER CLKAB CLKBA TRANSFER STORED DATA AND/OR
REAL-TIME TRANSFER
CLKAB CLKBA STORAGE FROM
numbers shown packages.
Figure Bus-Management Functions
POST OFFICE 655303
DALLAS, TEXAS 75265
SN54HC646, SN74HC646 OCTAL TRANSCEIVERS REGISTERS WITH 3-STATE OUTPUTS
FUNCTION TABLE INPUTS CLKAB CLKBA Input Unspecified Input Input disabled Output Output Input Input DATA Unspecified Input Input Input disabled Input Input Output Output OPERATION FUNCTION Store unspecified Store unspecified Store data Isolation, hold storage Real-time data Stored data Real-time data
Stored data data-output functions enabled disabled various signals DIR. Data-input functions always enabled; i.e., data terminals stored every low-to-high transition clock inputs.
logic symbol
CLKBA CLKAB [BA] [AB]
This symbol accordance with ANSI/IEEE 91-1984 Publication 617-12. numbers shown packages.
POST OFFICE 655303
DALLAS, TEXAS 75265
SN54HC646, SN74HC646 OCTAL TRANSCEIVERS REGISTERS WITH 3-STATE OUTPUTS
logic diagram (positive logic)
CLKBA CLKAB
Eight Channels
Seven Other Channels numbers shown packages.
absolute maximum ratings over operating free-air temperature range
Supply voltage range, -0.5 Input clamp current, VCC) (see Note Output clamp current, VCC) (see Note Continuous output current, VCC) Continuous current through Package thermal impedance, (see Note package 81°C/W package 67°C/W Storage temperature range, Tstg -65°C 150°C
Stresses beyond those listed under "absolute maximum ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated under "recommended operating conditions" implied. Exposure absolute-maximum-rated conditions extended periods affect device reliability. NOTES: input output voltage ratings exceeded input output current ratings observed. package thermal impedance calculated accordance with JESD except through-hole packages, which trace length zero.
POST OFFICE 655303
DALLAS, TEXAS 75265
SN54HC646, SN74HC646 OCTAL TRANSCEIVERS REGISTERS WITH 3-STATE OUTPUTS
recommended operating conditions
SN54HC646 Supply voltage High-level input voltage Low-level input voltage Input voltage Output voltage Input transition (rise fall) time Operating free-air temperature 3.15 1.35 1000 SN74HC646 3.15 1.35 1000 UNIT
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS -7.8 Control inputs Control inputs 3.98 5.48 25°C 1.998 4.499 5.999 0.002 0.001 0.001 0.17 0.15 ±0.1 ±0.01 0.26 0.26 ±100 ±0.5 SN54HC646 ±1000 SN74HC646 3.84 5.34 0.33 0.33 ±1000 UNIT
PRODUCT PREVIEW information concerns products formative design phase development. Characteristic data other specifications design goals. Texas Instruments reserves right change discontinue these products without notice.
POST OFFICE 655303
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SN54HC646, SN74HC646 OCTAL TRANSCEIVERS REGISTERS WITH 3-STATE OUTPUTS
timing requirements over recommended operating free-air temperature range (unless otherwise noted)
fclock Clock frequency Pulse duration, CLKBA CLKAB high Setup time, before CLKAB before CLKBA Hold time, after CLKAB after CLKBA 25°C SN54HC646 SN74HC646 UNIT
PRODUCT PREVIEW information concerns products formative design phase development. Characteristic data other specifications design goals. Texas Instruments reserves right change discontinue these products without notice.
POST OFFICE 655303
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SN54HC646, SN74HC646 OCTAL TRANSCEIVERS REGISTERS WITH 3-STATE OUTPUTS
switching characteristics over recommended operating free-air temperature range, (unless otherwise noted) (see Figure
PARAMETER FROM (INPUT) (OUTPUT) fmax CLKBA CLKAB tdis tdis 25°C SN54HC646 SN74HC646 UNIT
These parameters measured with internal output state storage register opposite that input.
PRODUCT PREVIEW information concerns products formative design phase development. Characteristic data other specifications design goals. Texas Instruments reserves right change discontinue these products without notice.
POST OFFICE 655303
DALLAS, TEXAS 75265
SN54HC646, SN74HC646 OCTAL TRANSCEIVERS REGISTERS WITH 3-STATE OUTPUTS
switching characteristics over recommended operating free-air temperature range, (unless otherwise noted) (see Figure
PARAMETER FROM (INPUT) (OUTPUT) CLKBA CLKAB 25°C SN54HC646 SN74HC646 UNIT
These parameters measured with internal output state storage register opposite that input.
operating characteristics, 25°C
PARAMETER Power dissipation capacitance TEST CONDITIONS load UNIT
PRODUCT PREVIEW information concerns products formative design phase development. Characteristic data other specifications design goals. Texas Instruments reserves right change discontinue these products without notice.
POST OFFICE 655303
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SN54HC646, SN74HC646 OCTAL TRANSCEIVERS REGISTERS WITH 3-STATE OUTPUTS
PARAMETER MEASUREMENT INFORMATION
PARAMETER tPZH tPZL tPHZ tPLZ Open Closed Open Closed Open Closed Open Closed Open Open
From Output Under Test (see Note
Test Point
tdis
LOAD CIRCUIT
High-Level Pulse
VOLTAGE WAVEFORMS PULSE DURATIONS
Reference Input Data Input
Low-Level Pulse
VOLTAGE WAVEFORMS SETUP HOLD INPUT RISE FALL TIMES
Input tPLH In-Phase Output tPHL Out-ofPhase Output tPLH tPHL
Output Control (Low-Level Enabling) tPZL Output Waveform (See Note tPZH Output Waveform (See Note
tPLZ tPHZ
VOLTAGE WAVEFORMS PROPAGATION DELAY OUTPUT TRANSITION TIMES
VOLTAGE WAVEFORMS ENABLE DISABLE TIMES 3-STATE OUTPUTS
NOTES: includes probe test-fixture capacitance. Waveform output with internal conditions such that output except when disabled output control. Waveform output with internal conditions such that output high except when disabled output control. Phase relationships between waveforms were chosen arbitrarily. input pulses supplied generators having following characteristics: MHz, clock inputs, fmax measured when input duty cycle 50%. outputs measured time with input transition measurement. tPLZ tPHZ same tdis. tPZL tPZH same ten. tPLH tPHL same tpd.
Figure Load Circuit Voltage Waveforms
POST OFFICE 655303
DALLAS, TEXAS 75265
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Copyright 1998, Texas Instruments Incorporated

Independent Registers Buses Multiplexed Real-Time Stored Data True Dat

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