
HEF4794B
8-stage shift-and-store register LED driver
The HEF4794B is an 8-stage serial shift register. It has a storage latch associated with each stage for strobing data from the serial input (D) to the parallel LED driver outputs (QP0 to QP7). Data is shifted on the positive-going clock (CP) transitions. The data in each shift register stage is transferred to the storage register when the strobe input (STR) is HIGH. Data in the storage register appears at the outputs whenever the output enable input (OE) signal is HIGH.
Two serial outputs (QS1 and QS2) are available for cascading a number of HEF4794B devices. Serial data is available at QS1 on positive-going clock edges to allow high-speed operation in cascaded systems with a fast clock rise time. The same serial data is available at QS2 on the next negative going clock edge. This is used for cascading HEF4794B devices when the clock has a slow rise time.
It operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS (usually ground). Unused inputs must be connected to VDD, VSS, or another input.
| Type number | Orderable part number | Ordering code (12NC) | Product status | Package | Packing | Marking | ECCN |
|---|---|---|---|---|---|---|---|
| HEF4794BP | HEF4794BP,112 | 9350 744 80112 | Volume production | SOT38-4 (DIP16) | Tube | Standard Marking | |
| HEF4794BT | HEF4794BT,112 | 9350 691 40112 | Volume production | SOT109-1 (SO16) | Tube | Standard Marking | |
| HEF4794BT | HEF4794BT,118 | 9350 691 40118 | Volume production | SOT109-1 (SO16) | Reel Pack, SMD, 13" | Standard Marking |
The variants in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.
| Type number | Orderable part number | Ordering code (12NC) | Product status | Package | Packing | Marking | ECCN |
|---|---|---|---|---|---|---|---|
| HEF4794BT/N | HEF4794BT/N,118 | 9352 771 11118 | Withdrawn Replacement product | SOT109-1 (SO16) | Reel Pack, SMD, 13" | Standard Marking |
| Type number | Package | No. of Pins | Voltage | Propagation Delay(ns) | Fmax(MHz) | Description | Logic Switching Levels | Power Dissipation Considerations | Output Drive Capability |
|---|---|---|---|---|---|---|---|---|---|
| HEF4794BP | SOT38-4 (DIP16) | 16 | 4.5-15.5 V | 45@15V | 28 @ 15 V | 8-Stage Shift-and-Store Register LED Driver | CMOS | Low Power or Automotive Applications | -20 mA |
| HEF4794BT | SOT109-1 (SO16) | 16 | 4.5-15.5 V | 45@15V | 28 @ 15 V | 8-Stage Shift-and-Store Register LED Driver | CMOS | Low Power or Automotive Applications | -20 mA |
| Type number | Orderable part number | Chemical content | RoHS | Leadfree conversion date | RHF | IFR (FIT) | MTBF (hours) | MSL | MSL LF |
|---|---|---|---|---|---|---|---|---|---|
| HEF4794BP | HEF4794BP,112 | HEF4794BP | Always Pb-free | 2.99 | 3.3444816053511703E8 | NA | NA | ||
| HEF4794BT | HEF4794BT,112 | HEF4794BT | week 12, 2005 | 2.99 | 3.3444816053511703E8 | 1 | 1 | ||
| HEF4794BT | HEF4794BT,118 | HEF4794BT | week 12, 2005 | 2.99 | 3.3444816053511703E8 | 1 | 1 |
The variants in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.
| Type number | Orderable part number | Chemical content | RoHS | Leadfree conversion date | RHF | IFR (FIT) | MTBF (hours) | MSL | MSL LF |
|---|---|---|---|---|---|---|---|---|---|
| HEF4794BT/N | HEF4794BT/N,118 | 2.99 | 3.3444816053511703E8 | 1 | 1 |
| Type | Format | Title | Date |
|---|---|---|---|
| Data sheet | 8-stage shift-and-store register LED driver (v.7.0) | 2011-11-16 | |
| Application note | Pin FMEA HEF4000 family (v.1.0) | 2011-04-28 |
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