器件名称:
M74HC259M1R
功能描述:
8 BIT ADDRESSABLE LATCH
文件大小:
264.52KB 共12页
简 介:
M54HC259 M74HC259 8 BIT ADDRESSABLE LATCH . . . . . . . . HIGH SPEED tPD = 15 ns (TYP.) at VCC = 5 V LOW POWER DISSIPATION ICC = 4 A (MAX.) at TA = 25 °C HIGH NOISE IMMUNITY VNIH = VNIL = 28 % VCC (MIN.) OUTPUT DRIVE CAPABILITY 10 LSTTL LOADS SYMMETRICAL PROPAGATION DELAYS IOH = IOL = 4 mA (MIN.) BALANCED PRORAGATION DELAYS tPLH = tPHL WIDE OPERATING VOLTAGE RANGE VCC (OPR) = 2 V to 6 V PIN AND FUNCTION COMPATIBLE WITH 54/74LS259 B1R (Plastic Package) F1R (Ceramic Package) M1R (Micro Package) C1R (Chip Carrier) ORDER CODES : M54HC259F1R M74HC259M1R M74HC259B1R M74HC259C1R DESCRIPTION The M54/74HC259 is a high speed CMOS 8 BIT ADDRESSABLE LATCH fabricated in silicon gate C2MOS technology. It has the same high speed performance of LSTTL combined with true CMOS low power consumption. The M54HC259/M74HC259 has single data input (D) 8 latch outputs (Q0-Q7), 3 address inputs (A, B, and C), common enable input (E), and a common CLEAR input. To operate this device as an addressable latch, data is held on the D input, and the address of the latch into which the data is to be entered is held on the A, B, and C inputs. When ENABLE is taken low the data flows through to the addresses output. The data is stored on the positive-going edge of the ENABLE pulse. All unaddressed latches will remain unaffected. With ENABLE in the high state the device is deselected and all latches remain in their previous state, unaffected by changes on the data or address inputs. To eliminate the possi……
