HD74HC194 4-bit Bidirectional Universal Shift Register Description This bidirectional shift register is designed to incorporate virtually all of the features a system designer may want in a shift register. It features parallel inputs, parallel outputs, right shift and left shift serial inputs, operating mode control inputs, and a direct overriding clear line. The register has four distinct modes of operation: parallel (broadside) load, shift right (in the direction Q A toware QD); shift left; inhibit clock (do nothing). Synchronous parallel loading is accomplished by applying the four bits of data and taking both mode control inputs, S0 and S1, high. The data are loaded into their respective flip-flops and appear at the outputs after the positive transition of the clock input. During loading, serial data flow is inhibited. Shift right is accomplished synchronously with the rising edge of the clock pulse when S0 is high and S1 is low. Serial data for this mode is entered at the shift right data input. When S 0 is low and S1 is high, data shifts left synchronously and new data is entered at the shift left serial input. Clocking of the flip-flops is inhibited when both mode control inputs are low. The mode control inputs should be changed only when the clock input is high. Features • • • • • High Speed Operation: tpd (Clock to Q) = 12 ns typ (CL = 50 pF) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max HD74HC194 Function Table Inputs Operating Mode Serial Parallel Outputs Mode Clear S1 S0 Clock Shift Left Shift Right A B C D QA QB QC QD Clear L X X X X X X X X X L L L L Parallel load H H H X X a c b c d Shift right H L H X H X X X X H QAn QBn QCn H L H X L X X X X L QAn QBn QCn H H L H X X X X X QBn QCn QDn H H H L L X X X X X QBn QCn QDn L H L L X X X X X X X QA0 QB0 QC0 QD0 H X X L X X X X X X QA0 QB0 QC0 QD0 H X X H X X X X X X QA0 QB0 QC0 QD0 Shift left Hold H : L : X : b d a high level (Steady state) low level (Steady state) don’t care : transition from low to high level. a, b, c, d : the level of steady-state input at inputs A, B, C or D respectively. QA0, QB0, QC0, QD0 : the level of QA, QB, QC or QD respectively, before the indicated steady-state input conditions were established. QAn, QBn, QCn, QDn the clock. 2 : the level of QA, QB, QC or QD respectively before the most recent transition of HD74HC194 Pin Arrangement 16 VCC Clear 1 Shift Right Serial-Input Parallel Inputs 2 R A 3 CLR QA 15 QA A QB 14 QB B 4 B QC Parallel 13 QC Outputs C 5 C QD 12 QD D 6 D CK 11 Clock S1 10 S1 Shift Left Serial-Input 7 L S0 GND 8 Mode Control 9 S0 (Top view) Timing Diagram Clock Mode Control Inputs S0 S1 Clear Serial Data Inputs Parallel Data Inputs R L A H B L C H D L QA QB Outputs QC QD Shift Right Clear Load Shift Left Inhibit Clear 3 HD74HC194 Logic Diagram Serial Shift Left D C B Serial Shift Right A S0 S1 D C C Q CL CL D C C Q CL CL D C C Q CL CL D C C Q CL CL Clock Clear QD 4 QC QB QA HD74HC194 DC Characteristics Ta = –40 to +85°C Ta = 25°C Item Symbol VCC (V) Min Typ Max Min Max Unit Input voltage VIH 2.0 1.5 — — 1.5 — V 4.5 3.15 — — 3.15 — 6.0 4.2 — — 4.2 — 2.0 — — 0.5 — 0.5 4.5 — — 1.35 — 1.35 6.0 — — 1.8 — 1.8 2.0 1.9 2.0 — 1.9 — 4.5 4.4 4.5 — 4.4 — 6.0 5.9 6.0 — 5.9 — 4.5 4.18 — — 4.13 — I OH = –4 mA 6.0 5.68 — — 5.63 — I OH = –5.2 mA 2.0 — 0.0 0.1 — 0.1 4.5 — 0.0 0.1 — 0.1 6.0 — 0.0 0.1 — 0.1 4.5 — — 0.26 — 0.33 I OL = 4 mA 6.0 — — 0.26 — 0.33 I OL = 5.2 mA VIL Output voltage VOH VOL Test Conditions V V V Vin = VIH or VIL I OH = –20 µA Vin = VIH or VIL I OL = 20 µA Input current Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC or GND Quiescent supply current I CC 6.0 — — 4.0 40 µA Vin = VCC or GND, Iout = 0 µA — 5 HD74HC194 AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) Ta = –40 to +85°C Ta = 25°C Item Symbol VCC (V) Min Typ Max Min Max Unit Maximum clock f max 2.0 — — 6 — 5 ns 4.5 — — 30 — 24 6.0 — — 35 — 28 Propagation delay t PHL 2.0 — — 140 — 175 time 4.5 — 12 28 — 35 6.0 — — 24 — 30 2.0 — — 140 — 175 4.5 — 12 28 — 35 6.0 — — 24 — 30 2.0 — — 150 — 190 4.5 — 13 30 — 38 6.0 — — 26 — 33 2.0 80 — — 100 — 4.5 16 6 — 20 — 6.0 14 — — 17 — 2.0 100 — — 125 — 4.5 20 7 — 25 — 6.0 17 — — 21 — 2.0 150 — — 187 — 4.5 30 17 — 37 — 6.0 25 — — 31 — 2.0 0 — — 0 — 4.5 0 –4 — 0 — 6.0 0 — — 0 — 2.0 25 — — 31 — 4.5 5 1 — 6 — 6.0 4 — — 5 — frequency t PLH t PHL Pulse width Setup time Hold time Removal time tw t su th t rem Output rise/fall t TLH 2.0 — — 75 — 95 time t THL 4.5 — 5 15 — 19 6.0 — — 13 — 16 — — 5 10 — 10 Input capacitance 6 Cin ns Test Conditions Clock to Q ns ns Clear to Q ns Clock or Clear ns A, B, C or D to Clock ns Mode controls to Clock ns Any input ns Clear inactive to Clock ns pF Unit: mm 19.20 20.00 Max 1 7.40 Max 9 6.30 16 8 1.3 0.48 ± 0.10 2.54 Min 5.06 Max 2.54 ± 0.25 0.51 Min 1.11 Max 7.62 + 0.13 0.25 – 0.05 0° – 15° Hitachi Code JEDEC EIAJ Weight (reference value) DP-16 Conforms Conforms 1.07 g Cautions 1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent, copyright, trademark, or other intellectual property rights for information contained in this document. Hitachi bears no responsibility for problems that may arise with third party’s rights, including intellectual property rights, in connection with use of the information contained in this document. 2. Products and product specifications may be subject to change without notice. Confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. 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Even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the Hitachi product. 5. This product is not designed to be radiation resistant. 6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from Hitachi. 7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor products. Hitachi, Ltd. Semiconductor & Integrated Circuits. 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