74HC161PW: Presettable synchronous 4-bit binary counter; asynchronous reset
The 74HC/1 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.
The 74HC/HCT161 are synchronous presettable binary counters which feature an internal look-ahead carry and can be used for high-speed counting.
Synchronous operation is provided by having all flip-flops clocked simultaneously on the positive-going edge of the clock (CP).
The outputs (Q0 to Q3) of the counters may be preset to a HIGH or LOW level. A LOW level at the parallel enable input (PE) disables the counting action and causes the data at the data inputs (D0 to D3) to be loaded into the counter on the positive-going edge of the clock (providing that the set-up and hold time requirements for PE are met). Preset takes place regardless of the levels at count enable inputs (CEP and CET).
A LOW level at the master reset input (MR) sets all four outputs of the flip-flops (Q0 to Q3) to LOW level regardless of the levels at CP, PE, CET and CEP inputs (thus providing an asynchronous clear function).
The look-ahead carry simplifies serial cascading of the counters. Both count enable inputs (CEP and CET) must be HIGH to count. The CET input is fed forward to enable the terminal count output (TC). The TC output thus enabled will produce a HIGH output pulse of a duration approximately equal to a HIGH level output of Q0. This pulse can be used to enable the next cascaded stage.
The maximum clock frequency for the cascaded counters is determined by the CP to TC propagation delay and CEP to CP set-up time, according to the following formula:
fmax= (1) / (tP(max)(CP to TC) + tSU(CEP to CP) )
74HC161PW: Product Block Diagram
Outline 3d SOT403-1
Data Sheets (1)
| Name/Description | Modified Date |
|---|---|
| Presettable synchronous 4-bit binary counter; asynchronous reset (REV 1.0) PDF (80.0 kB) 74HC_HCT161_CNV [English] | 01 Dec 1990 |
Application Notes (2)
| Name/Description | Modified Date |
|---|---|
| Live Insertion Aspects of Philips Logic Families (REV 1.0) PDF (73.0 kB) AN252 [English] | 13 Mar 2013 |
| Pin FMEA 74HC/74HCT family (REV 1.0) PDF (51.0 kB) AN11044 [English] | 16 Mar 2011 |
Users Guides (1)
| Name/Description | Modified Date |
|---|---|
| HC/T User Guide (REV 1.0) PDF (508.0 kB) HCT_USER_GUIDE [English] | 01 Nov 1997 |
Package Information (1)
| Name/Description | Modified Date |
|---|---|
| plastic thin shrink small outline package; 16 leads; body width 4.4 mm (REV 1.0) PDF (300.0 kB) SOT403-1 [English] | 08 Feb 2016 |
Packing (1)
| Name/Description | Modified Date |
|---|---|
| TSSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... (REV 1.0) PDF (218.0 kB) SOT403-1_118 [English] | 08 Apr 2013 |
Supporting Information (1)
| Name/Description | Modified Date |
|---|---|
| Footprint for wave soldering (REV 1.0) PDF (16.0 kB) SSOP-TSSOP-VSO-WAVE [English] | 08 Oct 2009 |
SPICE model
- hc Spice model (REV 1.0) ZIP HC 5/7/2013
Ordering Information
| Product | Status | Family | Function | VCC (V) | Output drive capability (mA) | Description | Package version | Logic switching levels | tpd (ns) | Power dissipation considerations | Tamb (Cel) | Rth(j-a) (K/W) | Ψth(j-top) (K/W) | Rth(j-c) (K/W) | Package name | No of pins |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 74HC161PW | Active | HC(T) | Binary counters/timers | 2.0 - 6.0 | +/- 5.2 | asynchronous reset | SOT403-1 | CMOS | 19 | low | -40~125 | 116 | 2.5 | 44.8 | TSSOP16 | 16 |
Package Information
| Product ID | Package Description | Outline Version | Reflow/Wave Soldering | Packing | Product Status | Part NumberOrdering code(12NC) | Marking | Chemical Content | RoHS / Pb Free / RHF | LeadFree Conversion Date | EFR | IFR(FIT) | MTBF(hour) | MSL | MSL LF |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 74HC161PW | | SOT403-1 | SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Active | 74HC161PW,118 (9351 883 20118) | HC161 | 74HC161PW |    | week 10, 2005 | 84.9 | 6.62 | 1.51E8 | 1 | 1 |
| Bulk Pack | Active | 74HC161PW,112 (9351 883 20112) | HC161 | 74HC161PW | | week 10, 2005 | 84.9 | 6.62 | 1.51E8 | 1 | 1 |
- Live Insertion Aspects of Philips Logic Families 74HC_T_245_Q100
- Pin FMEA 74HC/74HCT family 74HC_T_597_Q100
- HC/T User Guide 74HCU04PW
- hc Spice model 74HCU04PW
- SOT403-1 LPC812M101JDH16
- SSOP-TSSOP-VSO-WAVE LPC1114FDH28
- Reel 13" Q1/T1 LPC812M101JDH16
- 74LVC161
- PCA9633
