Wide Operating Voltage Range High-Current 3-State Outputs Drive LSTTL

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Wide Operating Voltage Range High-Current 3-State Outputs Drive LSTTL

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SN54HC646, SN74HC646 OCTAL TRANSCEIVERS REGISTERS WITH 3-STATE OUTPUTS
Wide Operating Voltage Range High-Current 3-State Outputs Drive LSTTL Loads Power Consumption, 80-µA Typical
SN54HC646 PACKAGE SN74HC646 PACKAGE (TOP VIEW)
±6-mA Output Drive Input Current Independent Registers Buses Multiplexed Real-Time Stored Data True Data Paths
SN54HC646 PACKAGE (TOP VIEW)
CLKAB
CLKBA
CLKAB CLKBA
internal connection
description/ordering information
'HC646 devices 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 bus-management functions that performed with 'HC646 devices. 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. ORDERING INFORMATION
PDIP -40°C 85°C SOIC CDIP -55°C 125°C PACKAGE Tube Tube Tape reel Tube Tube ORDERABLE PART NUMBER SN74HC646NT SN74HC646DW SN74HC646DWR SNJ54HC646JT SNJ54HC646W TOP-SIDE MARKING SN74HC646NT HC646 SNJ54HC646JT SNJ54HC646W
LCCC Tube SNJ54HC646FK SNJ54HC646FK Package drawings, standard packing quantities, thermal data, symbolization, design guidelines available www.ti.com/sc/package. Please aware that important notice concerning availability, standard warranty, critical applications Texas Instruments semiconductor products disclaimers thereto appears this data sheet.
Copyright 2003, Texas Instruments Incorporated
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
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SN54HC646, SN74HC646 OCTAL TRANSCEIVERS REGISTERS WITH 3-STATE OUTPUTS
description/ordering information (continued)
ensure high-impedance state during power power down, should tied through pullup resistor; minimum value resistor determined current-sinking capability driver. When output function disabled, input function still enabled used store data. Only buses, driven time.
FUNCTION TABLE INPUTS CLKAB CLKBA Input Unspecified Input Input disabled Output Output Input DATA Unspecified Input Input Input disabled Input Input Output OPERATION FUNCTION Store unspecified Store unspecified Store data Isolation, hold storage Real-time data Stored data Real-time data
Input Output 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.
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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
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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 (unless otherwise noted)
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 46°C/W (see Note 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 51-7. package thermal impedance calculated accordance with JESD 51-3.
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SN54HC646, SN74HC646 OCTAL TRANSCEIVERS REGISTERS WITH 3-STATE OUTPUTS
recommended operating conditions (see Note
SN54HC646 Supply voltage High-level input voltage Low-level input voltage Input voltage Output voltage Input transition (rise fall) time 3.15 1.35 1000 SN74HC646 3.15 1.35 1000 UNIT
Operating free-air temperature NOTE unused inputs device must held ensure proper device operation. Refer application report, Implications Slow Floating CMOS Inputs, literature number SCBA004.
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.
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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.
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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
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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) 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.
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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
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MECHANICAL DATA
MPDI004 OCTOBER 1994
(R-PDIP-T**)
PINS SHOWN
PLASTIC DUAL-IN-LINE PACKAGE
PINS
1.260 (32,04) 1.230 (31,24) 0.310 (7,87) 0.290 (7,37)
1.425 (36,20) 1.385 (35,18) 0.315 (8,00) 0.295 (7,49)
0.280 (7,11) 0.250 (6,35)
0.070 (1,78)
0.020 (0,51)
0.200 (5,08) Seating Plane 0.125 (3,18)
0.100 (2,54) 0.021 (0,53) 0.015 (0,38) 0.010 (0,25) 0.010 (0,25)
4040050 04/95 NOTES: linear dimensions inches (millimeters). This drawing subject change without notice.
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MECHANICAL DATA
MSOI003E JANUARY 1995 REVISED SEPTEMBER 2001
(R-PDSO-G**)
PINS SHOWN 0.020 (0,51) 0.014 (0,35)
PLASTIC SMALL-OUTLINE PACKAGE
0.050 (1,27)
0.010 (0,25)
0.419 (10,65) 0.400 (10,15) 0.299 (7,59) 0.291 (7,39) 0.010 (0,25)
Gage Plane 0.010 (0,25) 0.050 (1,27) 0.016 (0,40)
Seating Plane 0.104 (2,65) 0.012 (0,30) 0.004 (0,10) PINS 0.004 (0,10)
0.410 (10,41) 0.400 (10,16)
0.462 (11,73) 0.453 (11,51)
0.510 (12,95) 0.500 (12,70)
0.610 (15,49) 0.600 (15,24)
0.710 (18,03) 0.700 (17,78) 4040000/E 08/01
NOTES:
linear dimensions inches (millimeters). This drawing subject change without notice. Body dimensions include mold flash protrusion exceed 0.006 (0,15). Falls within JEDEC MS-013
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Wide Operating Voltage Range High-Current 3-State Outputs Drive LSTTL

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