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MC74ACT299DW Folha de dados(PDF) 3 Page - ON Semiconductor |
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MC74ACT299DW Folha de dados(HTML) 3 Page - ON Semiconductor |
3 / 12 page MC74AC299, MC74ACT299 http://onsemi.com 3 FUNCTIONAL DESCRIPTION The MC74AC299/74ACT299 contains eight edge−triggered D−type flip−flops and the interstage logic necessary to perform synchronous shift left, shift right, parallel load and hold operations. The type of operation is determined by S0 and S1, as shown in the Truth Table. All flip−flop outputs are brought out through 3−state buffers to separate I/O pins that also serve as data inputs in the parallel load mode. Q0 and Q7 are also brought out on other pins for expansion in serial shifting of longer words. A LOW signal on MR overrides the Select and CP inputs and resets the flip−flops. All other state changes are initiated by the rising edge of the clock. Inputs can change when the clock is in either state provided only that the recommended setup and hold times, relative to the rising edge of CP, are observed. A HIGH signal on either OE1 or OE2 disables the 3-state buffers and puts the I/O pins in the high impedance state. In this condition the shift, hold, load and reset operations can still occur. The 3−state buffers are also disabled by HIGH signals on both S0 and S1 in preparation for a parallel load operation. TRUTH TABLE Inputs Response MR S1 S0 CP Response L X X X Asynchronous Reset; Q0−Q7 = LOW H H H Parallel Load; I/On → Qn H L H Shift Rights; DS0 → Q0, Q0 → Q1, etc. H H L Shift Left; DS7 → Q7, Q7 → Q6, etc. H L L X Hold H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial = LOW-to-HIGH Transition MAXIMUM RATINGS* Symbol Parameter Value Unit VCC DC Supply Voltage (Referenced to GND) −0.5 to +7.0 V VIN DC Input Voltage (Referenced to GND) −0.5 to VCC +0.5 V VOUT DC Output Voltage (Referenced to GND) −0.5 to VCC +0.5 V IIN DC Input Current, per Pin ±20 mA IOUT DC Output Sink/Source Current, per Pin ±50 mA ICC DC VCC or GND Current per Output Pin ±50 mA Tstg Storage Temperature −65 to +150 °C *Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. RECOMMENDED OPERATING CONDITIONS Symbol Parameter Min Typ Max Unit V Supply Voltage ′AC 2.0 5.0 6.0 V VCC Supply Voltage ′ACT 4.5 5.0 5.5 V VIN, VOUT DC Input Voltage, Output Voltage (Ref. to GND) 0 − VCC V VCC @ 3.0 V − 150 − tr, tf Input Rise and Fall Time (Note 1) ′AC Devices except Schmitt Inputs VCC @ 4.5 V − 40 − ns/V r, f ′AC Devices except Schmitt Inputs VCC @ 5.5 V − 25 − t t Input Rise and Fall Time (Note 2) VCC @ 4.5 V − 10 − ns/V tr, tf In ut Rise and Fall Time (Note 2) ′ACT Devices except Schmitt Inputs VCC @ 5.5 V − 8.0 − ns/V TJ Junction Temperature (PDIP) − − 140 °C TA Operating Ambient Temperature Range −40 25 85 °C IOH Output Current − High − − −24 mA IOL Output Current − Low − − 24 mA 1. VIN from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times. 2. VIN from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times. |
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Descrição semelhante - MC74ACT299DW |
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