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SN74LV163APWTG4 TSSOP-16
TI
  • SN74LV163APWTG4
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SN74LV163APWTG4

Counter ICs 4B Sync Binary Counters

Manufacturer :
Texas Instruments, Inc
Package/Case :
TSSOP-16
Product Categories :
Counter ICs
Datasheet:
SN74LV163APWTG4 PDF
RoHs Status:
Rohs
In-stock:
200

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SN74LV163APWTG4 Product Details

The ’LV163A devices are 4-bit synchronous binary counters designed for 2-V to 5.5-V VCC operation.

These synchronous, presettable counters feature an internal carry look ahead for application in high-speed counting designs. The ’LV163A devices are 4-bit binary counters. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when instructed by the count-enable (ENP, ENT) inputs and internal gating. This mode of operation eliminates the output counting spikes normally associated with synchronous (ripple-clock) counters. A buffered clock (CLK) input triggers the four flip-flops on the rising (positive-going) edge of the clock waveform.

These counters are fully programmable; that is, they can be preset to any number between 0 and 9 or 15. As presetting is synchronous, setting up a low level at the load input disables the counter and causes the outputs to agree with the setup data after the next clock pulse, regardless of the levels of the enable inputs.

The clear function for the ’LV163A devices is synchronous. A low level at the clear (CLR)\ input sets all four of the flip-flop outputs low after the next low-to-high transition of CLK, regardless of the levels of the enable inputs. This synchronous clear allows the count length to be modified easily by decoding the Q outputs for the maximum count desired. The active-low output of the gate used for decoding is connected to CLR\ to synchronously clear the counter to 0000 (LLLL).

The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without additional gating. ENP, ENT, and a ripple-carry output (RCO) are instrumental in accomplishing this function. Both ENP and ENT must be high to count, and ENT is fed forward to enable RCO. Enabling RCO produces a high-level pulse while the count is maximum (9 or 15 with QA high). This high-level overflow ripple-carry pulse can be used to enable successive cascaded stages. Transitions at ENP or ENT are allowed, regardless of the level of CLK.

These counters feature a fully independent clock circuit. Changes at control inputs (ENP, ENT, or LOAD\) that modify the operating mode have no effect on the contents of the counter until clocking occurs. The function of the counter (whether enabled, disabled, loading, or counting) is dictated solely by the conditions meeting the stable setup and hold times.

These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down.

Feature

  • 2-V to 5.5-V VCC Operation
  • Max tpd of 9.5 ns at 5 V
  • Typical VOLP (Output Ground Bounce)
       <0.8 V at VCC = 3.3 V, TA = 25°C
  • Typical VOHV (Output VOH Undershoot)
       >2.3 V at VCC = 3.3 V, TA = 25°C
  • Support Mixed-Mode Voltage Operation on All Ports
  • Internal Look Ahead for Fast Counting
  • Carry Output for n-Bit Cascading
  • Synchronous Counting
  • Synchronously Programmable
  • Ioff Supports Partial-Power-Down Mode Operation
  • Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
  • ESD Protection Exceeds JESD 22
    • 2000-V Human-Body Model (A114-A)
    • 200-V Machine Model (A115-A)
    • 1000-V Charged-Device Model (C101)

Technical Parameters

Counter Type Binary Counters Package / Case TSSOP-16
Number of Bits 4 Packaging Reel
Counting Method Synchronous Mounting Style SMD/SMT
Operating Supply Voltage 2 V to 5.5 V Factory Pack Quantity 250

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