74HC194DB: 4-bit bidirectional universal shift register
The 74HC/HCT194 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 functional characteristics of the 74HC/HCT194 4-bit bidirectional universal shift registers are indicated in the logic diagram and function table. The registers are fully synchronous.
The '194' design has special features which increase the range of application. The synchronous operation of the device is determined by the mode select inputs (S0, S1).
As shown in the mode select table, data can be entered and shifted from left to right (Q0→ Q1→ Q2, etc.) or, right to left (Q3→ Q2→ Q1, etc.) or parallel data can be entered, loading all 4 bits of the register simultaneously. When both S0 and S1 are LOW, existing data is retained in a hold ('do nothing') mode. The first and last stages provide D-type serial data inputs (DSR, DSL) to allow multistage shift right or shift left data transfers without interfering with parallel load operation.
Mode select and data inputs are edge-triggered, responding only to the LOW-to-HIGH transition of the clock (CP). Therefore, the only timing restriction is that the mode control and selected data inputs must be stable one set-up time prior to the positive transition of the clock pulse.
The four parallel data inputs (D0 to D3) are D-type inputs. Data appearing on the D0 to D3 inputs, when S0 and S1 are HIGH, is transferred to the Q0 to Q3 outputs respectively, following the next LOW-to-HIGH transition of the clock. When LOW, the asynchronous master reset (MR) overrides all other input conditions and forces the Q outputs LOW.
The '194' is similar in operation to the '195' universal shift register, with added features of shift-left without external connections and hold ('do nothing') modes of operation.
Outline 3d SOT338-1
Data Sheets (1)
| Name/Description | Modified Date |
|---|---|
| 4-bit bidirectional universal shift register (REV 1.0) PDF (76.0 kB) 74HC_HCT194_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 shrink small outline package; 16 leads; body width 5.3 mm (REV 1.0) PDF (306.0 kB) SOT338-1 [English] | 08 Feb 2016 |
Supporting Information (2)
| Name/Description | Modified Date |
|---|---|
| Footprint for reflow soldering (REV 1.0) PDF (16.0 kB) SSOP-TSSOP-VSO-REFLOW [English] | 08 Oct 2009 |
| Footprint for wave soldering (REV 1.0) PDF (16.0 kB) SSOP-TSSOP-VSO-WAVE [English] | 08 Oct 2009 |
Ordering Information
| Product | Status | Family | VCC (V) | Function | Description | Logic switching levels | Output drive capability (mA) | Package version | tpd (ns) | fmax (MHz) | No of bits | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 74HC194DB | Active | HC(T) | 2.0 - 6.0 | Shift registers | 4-bit bidirectional parallel or serial-in/parallel-out shift register | CMOS | +/- 5.2 | SOT338-1 | 14 | 102 | 4 | low | -40~125 | 148 | 42.0 | SSOP16 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 74HC194DB | | SOT338-1 | SSOP-TSSOP-VSO-REFLOW
SSOP-TSSOP-VSO-WAVE SSOP-TSSOP-VSO-REFLOW SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Active | 74HC194DB,118 (9351 897 40118) | HC194 | 74HC194DB |    | week 12, 2005 | 84.9 | 6.62 | 1.51E8 | 1 | 1 |
| Bulk Pack | Active | 74HC194DB,112 (9351 897 40112) | HC194 | 74HC194DB | | week 12, 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
- plastic shrink small outline package; 16 leads; body width 5.3 mm 74HC_T_595_Q100
- Footprint for reflow soldering 74HC_T_595_Q100
- SSOP-TSSOP-VSO-WAVE LPC1114FDH28
- HEF4094B
