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2. 74VHC244
74VHC244 Octal Buffer/Line Driver with 3-STATE Outputs
General Description
The VHC244 is an advanced high speed CMOS octal bus buffer fabricated with silicon gate CMOS technology. It achieves high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. The VHC244 is a non-inverting 3-STATE buffer having two active-LOW output enables. These devices are designed to be used as 3-STATE memory address drivers, clock drivers, and bus oriented transmitter/receivers. An input protection circuit ensures that 0V to 7V can be applied to the input pins without regard to the supply voltage. This device can be used to interface 5V to 3V systems and two supply systems such as battery back up. This circuit prevents device destruction due to mismatched supply and input voltages.
Features
s High Speed: tPD = 3.9ns (typ) at VCC = 5V s High noise immunity: VNIH = VNIL = 28% VCC (min) s Power down protection is provided on all inputs s Low noise: VOLP = 0.6V (typ) s Low power dissipation: ICC = 4 mA (max) @ TA = 25°C s Pin and function compatible with 74HC244
Ordering Code:
Order Number 74VHC244M 74VHC244SJ 74VHC244MTC 74VHC244N Package Number M20B M20D MTC20 N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300î Wide 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300î Wide
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter ìXî to the ordering code.
Logic Symbol
IEEE/IEC
Connection Diagram
Pin Descriptions
Pin Names OE1, OE2 I0ñI7 O0ñO7 Description 3-STATE Output Enable Inputs Inputs 3-STATE Outputs
8-2
Samsung Electronics
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