HD74HC95 4-bit Parallel Access Shift Register Description This 4-bit register features parallel and serial inputs, parallel outputs, mode control, and two clock inputs. The register has three mode operation: • Parallel (broadside) load • Shift right (the direction Q A toward QD) • Shift left (the direction QD toward QA) Parallel loading is accomplished by applying the four bits of data and taking the mode conrol input high. The data is loaded into the associated flip-flops and appears at the outputs after the high-to-low transition of the clock-2 input. During loading, the entry of serial data is inhibited. Shift right is accomplished on the high-to-low transition of clock-1 when the mode control is low; shift left is accomplished on the high-tolow transition of clock-2 when the mode control is high by connecting the output of each flip-flop (Q D to input C, etc.) and serial data is entered at input D. The clock input may be applied commonly to clock-1 and clock-2 if both modes can be clocked from the same source. Changes at the mode control input should normally be made while both clock inputs are low: however, conditions described in the last three lines of the function table will also ensure that register contents are protected. Features • • • • • High Speed Operation: tpd (Clock to Q) = 17 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 (Ta = 25°C) HD74HC95 Function Table Inputs Clocks Parallel Outputs Mode Control 2 (L) 1 (R) Serial A B C D QA QB QC QD H X X X X X X QA0 QB0 QC0 QD0 H X X a b c d a b c d H X X QB+ QC+ QD+ d QBn QCn QDn d H X X X X X QA0 QB0 QC0 QD0 H L L L X H X X X X H QAn QBn QCn L X L X X X X L QAn QBn QCn L L X X X X X QA0 QB0 QC0 QD0 L L X X X X X QA0 QB0 QC0 QD0 L H X X X X X QA0 QB0 QC0 QD0 H L X X X X X QA0 QB0 QC0 QD0 H H X X X X X QA0 QB0 QC0 QD0 Pin Arrangement Serial Input 14 VCC 1 Serial A 2 A Input QA 13 QA B 3 B QB 12 QB C 4 C QC 11 QC D 5 D QD 10 QD 6 Mode CK1 9 7 CK2 8 Outputs Inputs Mode Control GND (Top View) 2 Clock1 R-Shift Clock2 L-Shift (Load) HD74HC95 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 — 3 HD74HC95 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 — — 4 — 3 MHz 4.5 — — 20 — 16 6.0 — — 24 — 19 Propagation delay t PLH 2.0 — — 145 — 180 time 4.5 — 17 29 — 36 6.0 — — 25 — 31 2.0 — — 170 — 215 4.5 — 17 34 — 43 6.0 — — 29 — 37 2.0 80 — — 100 — 4.5 16 6 — 20 — 6.0 14 — — 17 — 2.0 100 — — 125 — 4.5 20 2 — 25 — 6.0 17 — — 21 — 2.0 10 — — 10 — 4.5 10 –1 — 10 — 6.0 10 — — 10 — frequency t PHL Pulse width Setup time Hold time tw t su th 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 4 Cin Test Conditions ns ns ns ns ns ns pF Clock Unit: mm 19.20 20.32 Max 8 6.30 7.40 Max 14 1.30 7 2.54 ± 0.25 0.48 ± 0.10 0.51 Min 2.39 Max 2.54 Min 5.06 Max 1 7.62 + 0.10 0.25 – 0.05 0° – 15° Hitachi Code JEDEC EIAJ Weight (reference value) DP-14 Conforms Conforms 0.97 g Unit: mm 10.06 10.5 Max 8 5.5 14 1 0.10 ± 0.10 1.42 Max 1.27 *0.42 ± 0.08 0.40 ± 0.06 *0.22 ± 0.05 0.20 ± 0.04 2.20 Max 7 + 0.20 7.80 – 0.30 1.15 0° – 8° 0.70 ± 0.20 0.15 0.12 M *Dimension including the plating thickness Base material dimension Hitachi Code JEDEC EIAJ Weight (reference value) FP-14DA — Conforms 0.23 g Unit: mm 8.65 9.05 Max 8 1 7 *0.20 ± 0.05 0.635 Max 1.75 Max 3.95 14 + 0.10 6.10 – 0.30 1.08 *0.40 ± 0.06 0.11 0.14 +– 0.04 0° – 8° 1.27 0.67 0.60 +– 0.20 0.15 0.25 M *Pd plating Hitachi Code JEDEC EIAJ Weight (reference value) FP-14DN Conforms Conforms 0.13 g Cautions 1. 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