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74HC670DB Datasheet(PDF) 7 Page - NXP Semiconductors |
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74HC670DB Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 9 page December 1990 7 Philips Semiconductors Product specification 4 x 4 register file; 3-state 74HC/HCT670 AC CHARACTERISTICS FOR 74HCT GND = 0 V; tr =tf = 6 ns; CL =50pF SYMBOL PARAMETER Tamb (°C) UNIT TEST CONDITIONS 74HCT VCC (V) WAVEFORMS +25 −40 to +85 −40 to +125 min. typ. max. min. max. min. max. tPHL/ tPLH propagation delay RA, RB to Qn 21 40 50 60 ns 4.5 Fig.6 tPHL/ tPLH propagation delay WE to Qn 28 50 63 75 ns 4.5 Fig.7 tPHL/ tPLH propagation delay Dn to Qn 27 50 63 75 ns 4.5 Fig.7 tPZH/ tPZL 3-state output enable time RE to Qn 18 35 44 53 ns 4.5 Fig.9 tPHZ/ tPLZ 3-state output disable time RE to Qn 19 35 44 53 ns 4.5 Fig.9 tTHL/ tTLH output transition time 5 12 15 18 ns 4.5 Fig.6 tW write enable pulse width LOW 18 9 23 27 ns 4.5 Fig.8 tsu set-up time Dn to WE 12 4 15 18 ns 4.5 Fig.8 tsu set-up time WA, WB to WE 12 −2 15 18 ns 4.5 Fig.8 th hold time Dn to WE 5 −1 5 5 ns 4.5 Fig.8 th hold time WA, WB to WE 5 0 5 5 ns 4.5 Fig.8 tlatch latch time WE to RA, RB 25 11 31 38 ns 4.5 Fig.8 |
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