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 q d ) shift left (the direction q d toward q a ) 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-to- low 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: t pd (clock to q) = 17 ns typ (c l = 50 pf) high output current: fanout of 10 lsttl loads wide operating voltage: v cc = 2 to 6 v low input current: 1 ? max low quiescent supply current: i cc (static) = 4 ? max (ta = 25?)
hd74HC95 2 function table inputs clocks parallel outputs mode control 2 (l) 1 (r) serial a b c d q a q b q c q d h hxxxxxxq a0 q b0 q c0 q d0 h xxab c da bc d h xxq b+ q c+ q d+ dq bn q cn q dn d l lhxxxxxq a0 q b0 q c0 q d0 lx hxxxxhq an q bn q cn lx lxxxxlq an q bn q cn ll xxxxxq a0 q b0 q c0 q d0 ll xxxxxq a0 q b0 q c0 q d0 lhxxxxxq a0 q b0 q c0 q d0 hl xxxxxq a0 q b0 q c0 q d0 hhxxxxxq a0 q b0 q c0 q d0 pin arrangement 1 q a q b q c q d a b c d mode ck 1 ck 2 outputs (top view) 2 3 4 5 6 7 inputs a b c d mode control serial input serial input gnd v cc q a q b q c q d clock1 r-shift clock2 l-shift (load) 14 13 12 11 10 9 8
hd74HC95 3 dc characteristics ta = 25 c ta = ?0 to +85 c item symbol v cc (v) min typ max min max unit test conditions input voltage v ih 2.0 1.5 1.5 v 4.5 3.15 3.15 6.0 4.2 4.2 v il 2.0 0.5 0.5 v 4.5 1.35 1.35 6.0 1.8 1.8 output voltage v oh 2.0 1.9 2.0 1.9 v vin = v ih or v il i oh = ?0 m a 4.5 4.4 4.5 4.4 6.0 5.9 6.0 5.9 4.5 4.18 4.13 i oh = ? ma 6.0 5.68 5.63 i oh = ?.2 ma v ol 2.0 0.0 0.1 0.1 v vin = v ih or v il i ol = 20 m a 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 input current iin 6.0 0.1 1.0 m a vin = v cc or gnd quiescent supply current i cc 6.0 4.0 40 m a vin = v cc or gnd, iout = 0 m a
hd74HC95 4 ac characteristics (c l = 50 pf, input t r = t f = 6 ns) ta = 25 c ta = ?0 to +85 c item symbol v cc (v) min typ max min max unit test conditions maximum clock f max 2.0 4 3 mhz frequency 4.5 20 16 6.0 24 19 propagation delay t plh 2.0 145 180 ns time 4.5 17 29 36 6.0 25 31 t phl 2.0 170 215 ns 4.5 17 34 43 6.0 29 37 pulse width t w 2.0 80 100 ns clock 4.5 16 6 20 6.0 14 17 setup time t su 2.0 100 125 ns 4.5 20 2 25 6.0 17 21 hold time t h 2.0 10 10 ns 4.5 10 ? 10 6.0 10 10 output rise/fall t tlh 2.0 75 95 ns time t thl 4.5 5 15 19 6.0 13 16 input capacitance cin 5 10 10 pf
hitachi code jedec eiaj weight (reference value) dp-14 conforms conforms 0.97 g unit: mm 7.62 0.25 0 ?15 19.20 20.32 max 1 8 14 7 1.30 2.54 0.25 0.48 0.10 6.30 7.40 max 0.51 min 2.54 min 5.06 max + 0.10 ?0.05 2.39 max
hitachi code jedec eiaj weight (reference value) fp-14da conforms 0.23 g unit: mm *dimension including the plating thickness base material dimension *0.22 0.05 *0.42 0.08 0.70 0.20 0.12 0.15 0 ?8 m 0.10 0.10 2.20 max 5.5 10.06 1.42 max 14 8 1 7 10.5 max + 0.20 ?0.30 7.80 1.15 1.27 0.40 0.06 0.20 0.04
hitachi code jedec eiaj weight (reference value) fp-14dn conforms conforms 0.13 g unit: mm 0 ?8 1.27 14 8 1 7 0.15 0.25 m 1.75 max 3.95 *0.20 0.05 8.65 9.05 max *0.40 0.06 0.14 + 0.11 ?0.04 0.635 max 6.10 + 0.10 ?0.30 0.60 + 0.67 ?0.20 1.08 *pd plating
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