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Part: CD74FCT2952AM
Category:
Logic
-> Transceivers
-> Registered Transceivers
Description: ti CD74FCT2952A, Bicmos FCT Interface Logic Octal Non-inverting Bus Transceivers/registers With 3-State Outputs
Company: Texas Instruments, Inc.
Datasheet: Download CD74FCT2952AM datasheet File size : 283 kB
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Datasheet text preview:
CD74FCT2952A BiCMOS OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS
SCBS720 JULY 2000
D D D D D D D D D
BiCMOS Technology With Low Quiescent Power Buffered Inputs Noninverted Outputs Input/Output Isolation From VCC Controlled Output Edge Rates 64-mA Output Sink Current Output Voltage Swing Limited to 3.7 V at VCC = 5 V SCR Latch-Up-Resistant BiCMOS Process and Circuit Design Packaged in Plastic Small-Outline Package
M PACKAGE (TOP VIEW)
B8 B7 B6 B5 B4 B3 B2 B1 OEAB CLKAB CLKENAB GND
1 2 3 4 5 6 7 8 9 10 11 12
24 23 22 21 20 19 18 17 16 15 14 13
VCC A8 A7 A6 A5 A4 A3 A2 A1 OEBA CLKBA CLKENBA
description
The CD74FCT2952A is an octal transceiver and register, consisting of two 8-bit, back-to-back registers that store data flowing in both directions between two bidirectional buses. It uses a small-geometry BiCMOS technology. Data on the A or B bus is stored in the registers on the low-to-high transition of the clock (CLKAB or CLKBA) input if the clock-enable (CLKENAB or CLKENBA) input is low. Taking the output-enable (OEAB or OEBA) input low accesses the data on either port. This device contains two 8-bit, back-to-back registers that store data flowing in both directions between two bidirectional buses. Each register has separate clock, clock enable, and 3-state output enable signals associated with it. The output stage is a combination of bipolar and CMOS transistors that limits the output high level to two diode drops below VCC. This resultant lowering of output swing (0 V to 3.7 V) reduces power-bus ringing [a source of electromagnetic interference (EMI)] and minimizes VCC bounce and ground bounce and their effects during simultaneous output switching. The output configuration also enhances switching speed and is capable of sinking 64 mA. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. The CD74FCT2952A is characterized for operation from 0°C to 70°C.
FUNCTION TABLE INPUTS CLKENAB H X L L CLKAB X H or L OEAB L L L L A X X L H OUTPUT B B0 B0 L H
X X H X Z A-to-B data flow is shown; B-to-A data flow is similar, but uses CLKENBA, CLKBA, and OEBA. Level of B before the indicated steady-state input conditions were established
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.
Copyright © 2000, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
1
CD74FCT2952A BiCMOS OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS
SCBS720 JULY 2000
logic symbol
OEBA CLKENBA CLKBA OEAB CLKENAB CLKAB A1 15 13 14 9 11 10 16 EN3 G1 1 C5 EN4 G2 2 C6 3 6D A2 A3 A4 A5 A6 A7 A8 17 18 19 20 21 22 23 1 1 5D 4 7 6 5 4 3 2 1 B2 B3 B4 B5 B6 B7 B8 8 B1
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
2
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
CD74FCT2952A BiCMOS OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS
SCBS720 JULY 2000
logic diagram (positive logic)
CLKENAB 11
CLKAB OEAB CLKENBA
10 9 13
CLKBA OEBA
14 15 C1
A1
16
1D
8
B1
C1 1D
To Seven Other Channels
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
DC supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 6 V DC input clamp current, IIK (VI < 0.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA DC output clamp current, IOK (VO < 0.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA DC output sink current per output pin, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 mA DC output source current per output pin, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA Continuous current through VCC, ICC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 mA Continuous current through GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 528 mA Package thermal impedance, JA (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46°C/W Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: The package thermal impedance is calculated in accordance with JESD 51.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
3
CD74FCT2952A BiCMOS OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS
SCBS720 JULY 2000
recommended operating conditions (see Note 2)
MIN VCC VIH VIL VI VO IOH IOL t/v Supply voltage High-level input voltage Low-level input voltage Input voltage Output voltage High-level output current Low-level output current Input transition rise or fall rate 0 0 0 4.75 2 0.8 VCC VCC 15 48 10 MAX 5.25 UNIT V V V V V mA mA ns/V
TA Operating free-air temperature 0 70 °C NOTE 2: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER VIK VOH VOL II IOZ IOS ICC ICC Ci Co II = 18 mA IOH = 15 mA IOL = 64 mA VI = VCC or GND VO = VCC or GND VI = VCC or GND, VI = VCC or GND, One input at 3.4 V, Other inputs at VCC or GND VI = VCC or GND VO = VCC or GND VO = 0 IO = 0 TEST CONDITIONS CONDITIONS VCC 4.75 V 4.75 V 4.75 V 5.25 V 5.25 V 5.25 V 5.25 V 5.25 V 60 8 1.6 10 15 2.4 0.55 ±0.1 ±0.5 60 80 1.6 10 15 TA = 25°C MIN MAX 1.2 2.4 0.55 ±1 ±10 MIN MAX 1.2 UNIT V V V
mA mA
mA
mA
mA pF pF
Not more than one output should be tested at a time, and the duration of the test should not exceed 100 ms. This is the increase in supply current for each input at one of the specified TTL voltage levels rather than 0 V or VCC.
timing requirements over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) (see Figure 1)
MIN tw tsu th Pulse duration Setup time time Hold time time CLK high or low A or B CLKEN A or B CLKEN High or low or low 3 2 3 2 2 MAX UNIT ns ns ns
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
CD74FCT2952A BiCMOS OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS
SCBS720 JULY 2000
switching characteristics over recommended ranges of supply voltage and operating free-air temperature, CL = 50 pF (unless otherwise noted) (see Figure 1)
PARAMETER tpd ten tdis FROM (INPUT) CLKBA or CLKAB OEBA or OEAB OEBA or OEAB TO (OUTPUT) A or B A or B A or B TA = 25°C TYP 5.5 5.5 5.5 MIN 2 1.5 1.5 MAX 10 10.5 10 UNIT ns ns ns
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
5
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