Maker : Hitachi Semiconductor
Part No. : HC49

  Datasheet PDF : HC49.pdf
  Cross Reference : HC49 Cross Reference
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Shortcut : HC400201C-VA  HC400401C-VA  HC400402C-VA  HC4046  HC4052  HC4052  HC4052  HC4052  HC4052  HC4052  HC4052  HC4053  HC4053AFT  HC4060M  HC4094  HC47R2xx  HC49  HC49  HC49  HC49-3H  HC49-4H  HC49/4  HC49/4H  HC49/S  HC49H  HC49J  HC49J  HC49M  HC49SD  HC49SD  HC49U  HC49UM  HC49US  HC49US  HC49USSMD  HC4P5502B-5  HC4P5502B1-5  HC4P5504B-5  HC4P5504B-9  HC4P5504B1-5  HC4P5509A1R3060  HC4P5524-9 

Product Information

HD74HC490 Dual 4-bit Decade Counters Description This circuit contains eight master-slave flip-flops and additional gating to implement two individual 4-bit decade counters. Each decade counter has individual clock, clear and set-to-9 inputs. BCD count sequences of any length up to divide-by-100 may be implemented with a single HD74HC490. Buffering on each output is provided to ensure that suceptibility to collector communication is reduced significantly. The counters have paralle outputs from each counter state so that submultiples of the input count frequency are available for system timing signals. Features • • • • • High Speed Operation: tpd (Clock to QA) = 13 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 Clear/Set-To-9 Inputs Clear H L L Set-To-9 L H L Outputs QA L H Count QB L L QC L L QD L H HD74HC490 BCD Count Sequence Outputs Count 0 1 2 3 4 5 6 7 8 9 QD L L L L L L L L H H QC L L L L H H H H L L QB L L H H L L H H L L QA L H L H L H L H L H Pin Arrangement 1Clock 1Clear 1QA Output 1 Setto-9 1QB Outputs 1QC 1QD GND 1 2 3 4 CK CLR QA CLR QA 16 VCC 15 2Clock 14 2Clear 13 12 CK QB Set-to-9 QC 2QA Output 2 Setto-9 5 6 7 8 QB QC 11 2QB 10 2QC 9 2QD Outputs Set-to-9 QD QD (Top view) 2 HD74HC490 DC Characteristics Ta = 25°C Item Input voltage Symbol VIH Ta = –40 to +85°C Max — — — 0.5 1.35 1.8 — — — — — 0.1 0.1 0.1 0.33 0.33 ±1.0 40 µA µA I OL = 4 mA I OL = 5.2 mA Vin = VCC or GND Vin = VCC or GND, Iout = 0 µA V I OH = –4 mA I OH = –5.2 mA Vin = VIH or VIL I OL = 20 µA V Vin = VIH or VIL I OH = –20 µA V Unit V Test Conditions VCC (V) Min Typ Max Min 2.0 4.5 6.0 1.5 — 3.15 — 4.2 — — — — — — — — — — 0.5 1.5 3.15 4.2 — VIL 2.0 4.5 6.0 1.35 — 1.8 — 1.9 4.4 5.9 4.13 5.63 — — — Output voltage VOH 2.0 4.5 6.0 4.5 6.0 1.9 2.0 — 4.4 4.5 — 5.9 6.0 — 4.18 — 5.68 — — — — — — — — — — VOL 2.0 4.5 6.0 4.5 6.0 0.0 0.1 0.0 0.1 0.0 0.1 — — — — 0.26 — 0.26 — ±0.1 — 4.0 — Input current Quiescent supply current Iin I CC 6.0 6.0 3 HD74HC490 AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) Ta = 25°C Item Maximum clock frequency Symbol f max Ta = –40 to +85°C Max 3 16 19 150 30 26 255 51 43 350 70 60 255 51 43 255 51 43 240 48 41 — — — — — — 95 19 16 10 pF ns ns ns ns Set-to-9 to Q B, QC ns Set-to-9 to Q A, QD ns Clear to any output ns Clock to QC ns Clock to QB QC ns Clock to QA Unit MHz Test Conditions VCC (V) Min Typ Max Min 2.0 4.5 6.0 — — — — — — — — — — — — — — — — — — — — — 80 16 14 — — — — 13 — — 21 — — 23 — — 18 — — 13 — — 17 — — 6 — 4 20 24 — — — Propagation delay t PLH time t PHL 2.0 4.5 6.0 120 — 24 20 — — t PLH t PHL 2.0 4.5 6.0 205 — 41 35 — — t PLH t PHL 2.0 4.5 6.0 280 — 56 48 — — t PHL 2.0 4.5 6.0 205 — 41 35 — — t PLH 2.0 4.5 6.0 205 — 41 35 — — t PHL 2.0 4.5 6.0 190 — 38 32 — — — — — — 75 15 13 10 — — 100 20 17 125 25 21 — — — — Pulse width tw 2.0 4.5 6.0 Setup time t su 2.0 4.5 6.0 100 — 20 17 — — — — 1 — — 5 — 5 Output rise/fall time t TLH t THL 2.0 4.5 6.0 Input capacitance Cin — 4 Cautions 1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent, copyright, trademark, or other intellectual property rights for information contained in this document. Hitachi bears no responsibility for problems that may arise with third party’s rights, including intellectual property rights, in connection with use of the information contained in this document. 2. Products and product specifications may be subject to change without notice. Confirm that you have re...

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