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TC74HC697AP Fiches technique(PDF) 1 Page - Toshiba Semiconductor

No de pièce TC74HC697AP
Description  Synchronous Presettable 4-Bit Binary Up/Down Counter with Output Register
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Fabricant  TOSHIBA [Toshiba Semiconductor]
Site Internet  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TC74HC697AP Fiches technique(HTML) 1 Page - Toshiba Semiconductor

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TC74HC697AP/AF
2007-10-01
1
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74HC697AP,TC74HC697AF
Synchronous Presettable 4-Bit Binary Up/Down Counter with Output Register (multiplexed
3-state outputs)
The TC74HC697A is high speed CMOS UP/DOWN
COUNTERS fabricated with silicon gate C2MOS technology.
It achieve the high speed operation similar to equivalent
LSTTL while maintaining the CMOS low power dissipation.
It counts on the rising edge of the Counter Clock (CCK) input
when “counter mode” is selected. If the up/down (
D
U/ ) input is
held high, the internal counter counts up. Conversely, if
D
U/
is
held low, it counts down.
The internal counters outputs are latched into the output
registers on the rising edge of the Register Clock (RCK) input.
The outputs (QA~QD) are selected as either internal counter or
registered outputs by the output select ( C
R/ ) input. When high,
the outputs are counter outputs and when low, they are
registered outputs.
Two enable (
ENP , ENT ) inputs and a carry ( RCO ) output
are provided to enable cascading of the counters.
This facilitates easy implementation of n-bit counters without
using external gates.
All inputs are equipped with protection circuits against static
discharge or transient excess voltage.
Features
• High speed: fmax = 38 MHz (typ.) at VCC = 5 V
• Low power dissipation: ICC = 4 μA (max) at Ta = 25°C
• High noise immunity: VNIH = VNIL = 28% VCC (min)
• Outputs drive capability: 15 LSTTL loads for QA~QD
10 LSTTL loads for RCO
• Symmetrical output impedance:
|IOH| = IOL = 6 mA (min) for QA~QD
|IOH| = IOL = 4 mA (min) for RCO
• Balanced propagation delays: tpLH ∼− tpHL
• Wide operating voltage range: VCC (opr) = 2~6 V
• Pin and function compatible with 74LS697
TC74HC697AP
TC74HC697AF
Weight
DlP20-P-300-2.54A
: 1.30 g (typ.)
SOP20-P-300-1.27A
: 0.22 g (typ.)


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