74HC299DB: 8-bit universal shift register; 3-state
The 74HC299 is an 8-bit universal shift register with 3-state outputs. It
contains eight edge-triggered D-type flip-flops and the
interstage logic necessary to perform synchronous shift-right,
shift-left, parallel load and hold operations. The type of
operation is determined by the mode select inputs S0 and S1.
Pins I/O0 to I/O7 are flip-flop 3-state buffer outputs which
allow them to operate as data inputs in parallel load mode. The
serial outputs Q0 and Q7 are used for expansion in serial
shifting of longer words. A LOW signal on the asynchronous
master reset input MR overrides
the Sn and clock CP inputs and resets the flip-flops. All other
state changes are initiated by the rising edge of the clock
pulse. Inputs can change when the clock is either state,
provided that the recommended set-up and hold times are
observed. A HIGH signal on the 3-state output enable inputs OE1 or OE2 disables the 3-state
buffers and the I/On outputs assume a high-impedance OFF-state.
In this condition, the shift, hold, load and reset operations
can still occur. The 3-state buffers are also disabled by HIGH
signals on both S0 and S1, when in preparation for a parallel
load operation. Inputs include clamp diodes. This enables the
use of current limiting resistors to interface inputs to
voltages in excess of VCC.
74HC299DB: Product Block Diagram
Outline 3d SOT339-1
Data Sheets (1)
Application Notes (2)
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)
Packing (1)
Supporting Information (1)
Ordering Information
| Product | Status | Family | Function | VCC (V) | Logic switching levels | Description | 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 |
|---|
| 74HC299DB | Active | HC(T) | Shift registers | 2.0 - 6.0 | CMOS | 8-bit universal shift register (3-state) | +/- 7.8 | SOT339-1 | 19 | 54 | 8 | low | -40~125 | 136 | 40.0 | | SSOP20 | 20 |
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 |
|---|
| 74HC299DB | | SOT339-1 | SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Active | 74HC299DB,118
(9351 898 90118) | HC299 | 74HC299DB |    | week 17, 2005 | 84.9 | 6.62 | 1.51E8 | 1 | 1 |
| Bulk Pack | Active | 74HC299DB,112
(9351 898 90112) | HC299 | 74HC299DB | | week 17, 2005 | 84.9 | 6.62 | 1.51E8 | 1 | 1 |
