|
Details, datasheet, quote on part number:SN74FB2031RC
| |
Datasheet text preview:
SN74FB2031 9-BIT TTL/BTL ADDRESS/DATA TRANSCEIVER
SCBS176N NOVEMBER 1991 REVISED JUNE 2001
D D D D
Compatible With IEEE Std 1194.1-1991 (BTL) TTL A Port, Backplane Transceiver Logic (BTL) B Port Open-Collector B-Port Outputs Sink 100 mA High-Impedance State During Power Up and Power Down
D D D
BIAS VCC Minimizes Signal Distortion During Live Insertion or Withdrawal B-Port Biasing Network Preconditions the Connector and PC Trace to the BTL High-Level Voltage TTL-Input Structures Incorporate Active Clamping to Aid in Line Termination
RC PACKAGE (TOP VIEW)
A2 GND A1 VCC BIAS VCC OEA OEB OEB TC K VCC
1 2 3 4 5 6 7 8 9 10 11 12 13
GND A3 GND A4 GND A5 GND A6 GND A7 GND A8 GND
52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 14 15 16 17 18 19 20 21 22 23 24 25 26
TMS GND B1 GND B2 GND B3 GND B4 GND B5 GND B6 GND B7 GND B9 GND B8
Copyright 2001, Texas Instruments Incorporated
A9 SEL1 LCB BG VCC LCA
description
The SN74FB2031 is a 9-bit transceiver designed to translate signals between TTL and backplane transceiver logic (BTL) environments. The device is designed specifically to be compatible with IEEE Std 1194.1-1991. The B port operates at BTL-signal levels. The open-collector B ports are specified to sink 100 mA. Two output enables (OEB and OEB) are provided for the B outputs. When OEB is low, OEB is high, or VCC is less than 2.1 V, the B port is turned off. The A port operates at TTL signal levels. The A outputs reflect the inverse of the data at the B port when the A-port output enable (OEA) is high. When OEA is low or VCC is less than 2.1 V, the A outputs are in the high-impedance state. Pins are allocated for the four-wire IEEE Std 1149.1 (JTAG) test bus, although currently there are no plans to release a JTAG-featured version. TMS and TCK are not connected and TDI is shorted to TDO.
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.
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.
BG GND SEL0 TDO TDI VCC
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
1
SN74FB2031 9-BIT TTL/BTL ADDRESS/DATA TRANSCEIVER
SCBS176N NOVEMBER 1991 REVISED JUNE 2001
description (continued)
BIAS VCC establishes a voltage between 1.62 V and 2.1 V on the BTL outputs when VCC is not connected. BG VCC and BG GND are the supply inputs for the bias generator. ORDERING INFORMATION
TA PACKAGE ORDERABLE PART NUMBER TOP-SIDE MARKING
0°C to 70°C QFP RC Tube SN74FB2031RC FB2031 Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package.
Function Tables
TRANSCEIVER INPUTS OEA L H H H L L OEB H L X H L X OEB L X H L X H B d t to A bus data t b A data to B bus, B data to A bus Isolation FUNCTION A data to B bus
STORAGE MODE LCA, LCB 0 1 RESULT Transparent Latches latched Flip-flops triggered SELECT SEL1 0 0 1 1 SEL0 0 1 0 1 MUX AB Latch Through Flip-flop Flip-flop MUX BA Latch Through Flip-flop Latch
2
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN74FB2031 9-BIT TTL/BTL ADDRESS/DATA TRANSCEIVER
SCBS176N NOVEMBER 1991 REVISED JUNE 2001
functional block diagram
18 LCA 20 SEL0 15 SEL1 16 LCB OEB 46 45 47 1D C1 40 MUX
OEB OEA
1D C1 A1 50
B1
MUX
1D C1 1D C1
To Eight Other Channels
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V Input voltage range, VI: Except B port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 V to 7 V B port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 V to 3.5 V Voltage range applied to any B output in the disabled or power-off state, VO . . . . . . . . . . . . . . 0.5 V to 3.5 V Voltage range applied to any output in the high state, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to VCC Input clamp current, IIK: Except B port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 mA B port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 mA Current applied to any single output in the low state, IO: A port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA B port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mA Package thermal impedance, JA (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44°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 51-7.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
3
|
|
