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CD74HC646M датащи(PDF) 1 Page - Texas Instruments |
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CD74HC646M датащи(HTML) 1 Page - Texas Instruments |
1 / 14 page 1 Data sheet acquired from Harris Semiconductor SCHS193A Features • Independent Registers for A and B Buses • Non-Inverting • Three-State Outputs • Drives 15 LSTTL Loads • Typical Propagation Delay = 12ns (A to B, B to A) at VCC = 5V, CL = 15pF, TA = 25 oC • Fanout (Over Temperature Range) - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads • Wide Operating Temperature Range . . . -55oC to 125oC • Balanced Propagation Delay and Transition Times • Significant Power Reduction Compared to LSTTL Logic ICs • HC Types - 2V to 6V Operation - High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V Pinout CD74HC646 (SOIC) TOP VIEW Description The CD74HC646 is an octal bus transceiver/register with three-state non-inverting outputs. This device is a bus transceiver with D-type flip-flops which act as internal storage registers. Data on the A bus or the B bus can be clocked into the registers on the Low-to-High transition of either CAB or CBA clock inputs. Outputs enable (OE) and direction (DIR) inputs control the transceiver functions. Data present at the high impedance output can be stored in either register or both but only one of the two buses can be enabled as outputs at any one time. The select controls (SAB and SBA) can multiplex stored and transparent (real time) data. The direction control determines which data bus will receive data when the output enable (OE) is Low. In the high impedance mode (output enable High), A data can be stored in one register and B data can be stored in the other register. The clocks are not gated with the direction (DIR) and output enable (OE) terminals; data at the A or B terminals can be clocked into the storage flip-flops at any time. 1 2 3 4 5 6 7 8 9 10 11 12 CAB SAB DIR A0 A1 A2 A3 A4 A5 A6 A7 GND 16 17 18 19 20 21 22 23 24 15 14 13 VCC SBA OE B0 B1 B3 B5 B6 B7 CBA B2 B4 Ordering Information PART NUMBER TEMP. RANGE (oC) PACKAGE CD74HC646M -55 to 125 24 Ld SOIC CD74HC646M96 -55 to 125 24 Ld SOIC NOTE: When ordering, use the entire part number. The suffix 96 denotes tape and reel. January 1998 - Revised May 2003 CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. Copyright © 2003, Texas Instruments Incorporated CD74HC646 High-Speed CMOS Logic Octal Bus Transceiver/Register, Three-State NOT RECOMMENDED FOR NEW DESIGNS |
Аналогичный номер детали - CD74HC646M |
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Аналогичное описание - CD74HC646M |
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