HD74HC155 Dual 2-to-4-line Decoders/Demultiplexers Description This circuit features dual 1-line-to-4-line demultiplexer with individual strobes and common binary-address input. When both sections are enabled by the strobes, the common binary-address inputs sequentially select and route associated input data to the appropriate output of each section. The individual strobes permit activating or inhibiting each of the 4-bit sections as desired. Data applied to input 1C is inverted through its outputs. The inverter following the 1C data input permits use as a 3-to-8-line decoder or 1-to-8line demultiplexer without external gating. Features • • • • • High Speed Operation: tpd (A or B to Y) = 15 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) Function Table 2-line-to-4-line Decoder/1-line-to-4-line Demultiplexer Inputs Select Strobe Data Outputs B A 1G 1C 1Y0 1Y1 1Y2 1Y3 X X H X H H H H L L L H L H H H L H L H H L H H H L L H H H L H H H L H H H H L X X X L H H H H HD74HC155 Inputs Select Strobe Data Outputs B A 2G 2C 2Y0 2Y1 2Y2 2Y3 X X H X H H H H L L L L L H H H L H L L H L H H H L L L H H L H H H L L H H H L X X X H H H H H 3-line-to-8-line Decoder/1-line-to-8-line Demultiplexer Inputs Outputs Select Strobe Data 0 1 2 3 4 5 6 7 C B A G 2Y0 2Y1 2Y2 2Y3 1Y0 1Y1 1Y2 1Y3 X X X H H H H H H H H H L L L L L H H H H H H H L L H L H L H H H H H H L H L L H H L H H H H H L H H L H H H L H H H H H L L L H H H H L H H H H L H L H H H H H L H H H H L L H H H H H H L H H H H L H H H H H H H L Notes: 1. C: inputs 1C and 2C connected together 2. G: inputs 1G and 2G connected together 3. X: irrelevant 2 HD74HC155 Pin Arrangement Data 1 1C 16 VCC Strobe 1G 2 15 Data 2C Select Input B 3 Strobe 14 2G 1Y2 5 1Y2 Outputs 1Y1 6 1Y0 7 1Y1 1Y0 Select 13 Input A B B B B A A A A 2C 2G 1Y3 1C 1G 1Y3 4 GND 8 2Y3 12 2Y3 2Y2 11 2Y2 2Y1 10 2Y1 2Y0 9 2Y0 Outputs (Top view) 3 HD74HC155 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 4 — HD74HC155 AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) Ta = –40 to +85°C Ta = 25°C VCC (V) Min Typ Max Min Max Unit Test Conditions Propagation delay t PLH 2.0 — — 160 — 200 ns A, B, 2C, 1G or 2G to Y time 4.5 — 13 32 — 40 6.0 — — 27 — 34 2.0 — — 160 — 200 4.5 — 15 32 — 40 6.0 — — 27 — 34 2.0 — — 145 — 180 4.5 — 14 29 — 36 6.0 — — 25 — 31 Item Symbol t PHL 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 Cin A or B to Y 1C to Y ns pF 5 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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