74HC299; 74HCT299

General description

The 74HC299; 74HCT299 are high-speed Si-gate CMOS devices which are pin-compatible with Low-power Schottky TTL (LSTTL) devices. They are specified in compliance with JEDEC standard no. 7A.

The 74HC299; 74HCT299 contain eight edge-triggered D-type flip-flops and the interstage logic necessary to perform synchronous shift-right, shift-left, parallel load and hold operations. An operation is determined by the mode select inputs S0 and S1, as shown in Table 3.

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 in 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 are set to the high-impedance OFF-state. In this condition, the shift, hold, load and reset operations still occur when preparing for a parallel load operation. The 3-state buffers are also disabled by HIGH signals on both S0 and S1.

Features

• Multiplexed inputs/outputs provide improved bit density
• Four operating modes:
  • Shift left
  • Shift right
  • Hold (store)
  • Load data
• Operates with output enable or at high-impedance OFF-state (Z)
• 3-state outputs drive bus lines directly
• Cascadable for n-bit word lengths
• ESD protection:
  • HBM JESD22-A114E exceeds 2000 V
  • MM JESD22-A115-A exceeds 200 V
• Specified from -40 Cel to +85 Cel and from -40 Cel to +125 Cel

Products/packages

Pricing/ordering/availability

Block diagrams/pinning

Design support

Support Documents

HCT_USER_GUIDE; HC/T User Guide (1997-11-01)

Parametrics/similar products

Similar products
74HC299; 74HCT299 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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