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Part: SN74LV161APWR
Category:
Logic
-> Counters
-> Binary Counters
Description: ti SN74LV161A, 4-Bit Synchronous Binary Counters
Company: Texas Instruments, Inc.
Datasheet: Download SN74LV161APWR datasheet File size : 214 kB
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Datasheet text preview:
SN54LV161A, SN74LV161A 4-BIT SYNCHRONOUS BINARY COUNTERS
SCLS404C APRIL 1998 REVISED JULY 2003
D D D D D D D D D D D D
2-V to 5.5-V VCC Operation Max tpd of 9.5 ns at 5 V Typical VOLP (Output Ground Bounce) 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)
SN54LV161A . . . J OR W PACKAGE SN74LV161A . . . D, DB, DGV, NS, OR PW PACKAGE (TOP VIEW)
CLR CLK A B C D ENP GND
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
VCC RCO QA QB QC QD ENT LOAD
SN54LV161A . . . FK PACKAGE (TOP VIEW)
description/ordering information
The 'LV161A devices are 4-bit synchronous binary counters designed for 2-V to 5.5-V VCC operation. ORDERING INFORMATION
TA SOIC D SOP NS 40°C to 85°C to 85°C SSOP DB TSSOP PW TVSOP DGV CDIP J 55°C to 125°C CFP W LCCC FK PACKAGE Tube of 40 Reel of 2500 Reel of 2000 Reel of 2000 Tube of 90 Reel of 2000 Reel of 250 Reel of 2000 Tube of 25 Tube of 150 Tube of 55
A B NC C D
CLK CLR NC VCC RCO
4 5 6 7 8 3 2 1 20 19 18 17 16 15 14 9 10 11 12 13
QA QB NC QC QD
NC No internal connection
ORDERABLE PART NUMBER SN74LV161AD SN74LV161ADR SN74LV161ANSR SN74LV161ADBR SN74LV161APW SN74LV161APWR SN74LV161APWT SN74LV161ADGVR SNJ54LV161AJ SNJ54LV161AW SNJ54LV161AFK
TOP-SIDE MARKING LV161A 74LV161A LV161A LV161A LV161A SNJ54LV161AJ SNJ54LV161AW
SNJ54LV161AFK Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
UNLESS OTHERWISE NOTED this document contains PRODUCTION DATA information current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303
Copyright 2003, Texas Instruments Incorporated
· DALLAS, TEXAS 75265
LOAD ENT
ENP GND NC
1
SN54LV161A, SN74LV161A 4-BIT SYNCHRONOUS BINARY COUNTERS
SCLS404C APRIL 1998 REVISED JULY 2003
description/ordering information (continued)
These synchronous, presettable counters feature an internal carry look-ahead for application in high-speed counting designs. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable (ENP, ENT) inputs and internal gating. This mode of operation eliminates the output counting spikes that normally are 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 'LV161A devices is asynchronous. A low level at the clear (CLR) input sets all four of the flip-flop outputs low, regardless of the levels of the CLK, load (LOAD), or enable inputs. The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without additional gating. Instrumental in accomplishing this function are ENP, ENT, and a ripple-carry output (RCO). 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.
FUNCTION TABLE INPUTS CLR L H H H H H LOAD X L H H H X ENP X X X L H X ENT X X L X H X CLK X QA L A OUTPUTS QB L B QC L C QD L D FUNCTION Reset to "0" Preset Data No Count No Count Count No Count
No Change No Change Count up No Change
2
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54LV161A, SN74LV161A 4-BIT SYNCHRONOUS BINARY COUNTERS
SCLS404C APRIL 1998 REVISED JULY 2003
logic diagram (positive logic)
LOAD ENT ENP 9 10 7 LD CK CLK CLR 2 1 CK R LD 15
RCO
A
3
M1 G2 1, 2T/1C3 G4 3D 4R M1 G2 1, 2T/1C3 G4 3D 4R
14
QA
13
QB
B
4
C
5
M1 G2 1, 2T/1C3 G4 3D 4R
12
QC
D
6
M1 G2 1, 2T/1C3 G4 3D 4R
11
QD
For simplicity, routing of complementary signals LD and CK is not shown on this overall logic diagram. The uses of these signals are shown on the logic diagram of the D/T flip-flops. Pin numbers shown are for the D, DB, DGV, J, NS, PW, and W packages.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
3
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