HD74AC670 4 × 4 Register File with 3-State Output Description The HD74AC670 contains 16 high speed, low power, transparent D-type latches arranged as four words of four bits each, to function as a 4 × 4 register file. Separate read and write inputs, both address and enable, allow simultaneous read and write operation. The 3-state outputs make it possible to connect up to 128 outputs to increase the word capacity up to 512 words. Any number of these devices can be operated in parallel to generate an n-bit length. Features • 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers • Outputs Source/Sink 24 mA Pin Arrangement D2 1 16 VCC D3 2 15 D1 D4 3 14 WA0 RA1 4 13 WA1 RA0 5 12 WE O4 6 11 OE O3 7 10 O1 GND 8 9 O2 (Top view) HD74AC670 Logic Symbol 12 15 1 2 3 WE D1 D2 D3 D4 OE O1 O2 O3 O4 11 10 9 7 6 14 WA0 13 WA1 5 RA0 4 RA0 VCC=Pin 16 GND=Pin 8 Pin Names D1 to D4 WA 0, WA 1 WE RA0, RA1 OE O1 to O4 Data Inputs Write Address Inputs Write Enable Input (Active Low) Read Address Inputs 3-State Output Enable Input (Active Low) Data Outputs Write Function Table Write Inputs WE WA1 WA0 D Inputs to L L L Word 0 L L H Word 1 L H L Word 2 L H H Word 3 H X X None (hold) H : L : X : 2 High Voltage Level Low Voltage Level Immaterial HD74AC670 Read Function Table Read Inputs OE RA1 RA0 Outputs from L L L Word 0 L L H Word 1 L H L Word 2 L H H Word 3 H X X None (HIGH Z) H : L : X : High Voltage Level Low Voltage Level Immaterial 3 HD74AC670 Logic Diagram D4 D3 D2 D1 WE WA1 WA0 G D G Q G G Q D G Q G D D G Q G Q G Q D D D G Q Word 0 Q G Q D D D Word 1 Q D G Q D Word 2 Q Word 3 G D G Q D G Q D G Q D Q RA1 OE RA0 O4 O3 O2 O1 DC Characteristics (unless otherwise specified) Item Symbol Max Unit Condition Maximum quiescent supply current I CC 80 µA VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case Maximum quiescent supply current I CC 8.0 µA VIN = VCC or ground, VCC = 5.5 V, Ta = 25°C 4 HD74AC670 AC Characteristics: HD74AC670 Ta = +25°C CL = 50 pF Ta = –40°C to +85°C CL = 50 pF Item Symbol VCC (V)*1 Min Typ Max Min Max Unit Propagation delay t PLH 3.3 1.0 14.0 17.5 1.0 19.0 ns 5.0 1.0 11.5 13.5 1.0 15.0 3.3 1.0 13.5 17.0 1.0 18.5 5.0 1.0 11.0 13.0 1.0 14.5 3.3 1.0 12.5 15.5 1.0 17.0 5.0 1.0 10.0 12.0 1.0 13.0 3.3 1.0 12.5 15.5 1.0 17.0 5.0 1.0 10.0 12.0 1.0 13.0 3.3 1.0 12.0 15.0 1.0 16.5 5.0 1.0 9.5 11.5 1.0 12.5 3.3 1.0 11.5 14.5 1.0 16.0 5.0 1.0 9.0 11.0 1.0 12.0 3.3 1.0 8.0 11.0 1.0 12.0 5.0 1.0 6.0 8.5 1.0 9.5 3.3 1.0 10.0 12.0 1.0 13.0 5.0 1.0 7.5 9.5 1.0 10.5 3.3 1.0 8.0 11.0 1.0 12.0 5.0 1.0 6.0 8.5 1.0 9.5 3.3 1.0 9.0 11.5 1.0 12.5 5.0 1.0 7.0 9.0 1.0 10.0 WE to On Propagation delay t PHL WE to On Propagation delay t PLH RA1 or RA0 to On Propagation delay t PHL RA1 or RA0 to On Propagation delay t PLH Data to O n Propagation delay t PHL Data to O n Enable time t PZH OE to O n Enable time t PZL OE to O n Disable time t PHZ OE to O n Disable time OE to O n Note: t PLZ ns ns ns ns ns ns ns ns ns 1. Voltage Range 3.3 is 3.3 V ± 0.3 V Voltage Range 5.0 is 5.0 V ± 0.5 V 5 HD74AC670 AC Operating Requirements: HD74AC670 Ta = –40°C to +85°C CL = 50 pF Ta = +25°C CL = 50 pF Item Symbol VCC (V)*1 Typ Guaranteed Minimum Unit Setup time t su 3.3 3.0 5.5 6.0 ns Data to WE 5.0 2.0 4.0 4.5 Setup time 3.3 3.0 5.5 6.0 WA1 or WA0 to WE 5.0 2.0 4.5 4.5 3.3 3.0 4.0 4.0 WE to Data 5.0 2.5 4.0 4.0 Hold time 3.3 3.0 4.0 4.0 WE to WA1 or WA2 5.0 2.5 4.0 4.0 3.3 3.5 5.5 7.0 5.0 2.5 4.5 5.0 3.3 0.5 10.0 10.0 5.0 0.5 10.0 10.0 Hold time Pulse width th tw WE Latch width t latch WE to 1 Note: 1. Voltage Range 3.3 is 3.3 V ± 0.3 V Voltage Range 5.0 is 5.0 V ± 0.5 V Capacitance Item Symbol Typ Unit Condition Input capacitance CIN 4.5 pF VCC = 5.5 V Power dissipation capacitance CPD 60 pF VCC = 5.0 V 6 ns ns ns ns ns 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 Unit: mm 10.06 10.5 Max 9 1 8 1.27 *0.42 ± 0.08 0.40 ± 0.06 0.10 ± 0.10 0.80 Max *0.22 ± 0.05 0.20 ± 0.04 2.20 Max 5.5 16 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-16DA — Conforms 0.24 g Unit: mm 9.9 10.3 Max 9 1 8 0.635 Max *0.42 ± 0.08 0.40 ± 0.06 0.15 *0.22 ± 0.03 0.20 ± 0.03 1.27 0.11 0.14 +– 0.04 1.75 Max 3.95 16 0.10 6.10 +– 0.30 1.08 0° – 8° 0.67 0.60 +– 0.20 0.25 M *Dimension including the plating thickness Base material dimension Hitachi Code JEDEC EIAJ Weight (reference value) FP-16DN Conforms Conforms 0.15 g Cautions 1. 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