DS1646

DS1640 : VCC GND IN1-IN4 OUT1-OUT4 GATE1-GATE4 NC LATCH - +3 to +5 Volt Input - Ground - FET Sources - FET Drains - FET Control Gates - No Connection - Gate Inputs Latch Control DESCRIPTION The DS1640 contains four P channel power MOS FETs designed as switches to conserve power in personal computer systems. When connected to power management control units, power consuming devices like disk drives or display panel backlights can be routinely shut down to conserve battery or main power supply energy. The P channel power MOS FETs are individually controlled and are capable of handling 300 mA each continuously with less than 0.2 volts drop from input to output. The device requires a +3 Û +5 volt power s.

DS1640C : VCC GND IN1-IN4 OUT1-OUT4 GATE1-GATE4 NC LATCH - +3 to +5 Volt Input - Ground - FET Sources - FET Drains - FET Control Gates - No Connection - Gate Inputs Latch Control DESCRIPTION The DS1640 contains four P channel power MOS FETs designed as switches to conserve power in personal computer systems. When connected to power management control units, power consuming devices like disk drives or display panel backlights can be routinely shut down to conserve battery or main power supply energy. The P channel power MOS FETs are individually controlled and are capable of handling 300 mA each continuously with less than 0.2 volts drop from input to output. The device requires a +3 Û +5 volt power s.

DS1642 : PIN NAME FUNCTION 1 A7 2 A6 3 A5 4 A4 5 A3 6 A2 Address Input 7 A1 8 A0 19 A10 22 A9 23 A8 9 DQ0 10 DQ1 11 DQ2 13 14 DQ3 DQ4 Data Input/Output 15 DQ5 16 DQ6 17 DQ7 12 GND Ground 18 CE Active-Low Chip-Enable Input 20 OE Active-Low Output-Enable Input 21 WE Active-Low Write-Enable Input 24 VCC Power-Supply Input DS1642 DESCRIPTION The DS1642 is a 2k x 8 nonvolatile static RAM and a full-function real-time clock (RTC), both of which are accessible in a bytewide format. The nonvolatile time keeping RAM is pin and function equivalent to any JEDEC-standard 2k x 8 SRAM. The device can also be easily substituted in ROM, EPROM, and EEPROM sockets, providing read/write nonvol.

DS1643 : PDIP 1 2 3 4 5 6 7 8 9 10 21 23 24 25 11 12 13 15 16 17 18 19 20 22 26 27 28 — 14 — PIN PowerCap 1, 2, 3, 31–34 30 25 24 23 22 21 20 19 18 28 29 27 26 16 15 14 13 12 11 10 9 8 7 — 6 5 4 17 NAME N.C. A12 A7 A6 A5 A4 A3 A2 A1 A0 A10 A11 A9 A8 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 CE OE CE2 WE VCC PFO GND X1, X2, VBAT No Connection FUNCTION Address Inputs Data Input/Output Active-Low Chip-Enable Input Active-Low Output-Enable Input Chip-Enable 2 Input (Active High) Active-Low Write-Enable Input Power-Supply Input Active-Low Power-Fail Output. This open-drain pin requires a pullup resistor for proper operation. Ground Crystal Connection, Battery Connection 2 of 17 DS1643/DS1643P www.DataSheet4U.c.

DS1643P : PDIP 1 2 3 4 5 6 7 8 9 10 21 23 24 25 11 12 13 15 16 17 18 19 20 22 26 27 28 — 14 — PIN PowerCap 1, 2, 3, 31–34 30 25 24 23 22 21 20 19 18 28 29 27 26 16 15 14 13 12 11 10 9 8 7 — 6 5 4 17 NAME N.C. A12 A7 A6 A5 A4 A3 A2 A1 A0 A10 A11 A9 A8 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 CE OE CE2 WE VCC PFO GND X1, X2, VBAT No Connection FUNCTION Address Inputs Data Input/Output Active-Low Chip-Enable Input Active-Low Output-Enable Input Chip-Enable 2 Input (Active High) Active-Low Write-Enable Input Power-Supply Input Active-Low Power-Fail Output. This open-drain pin requires a pullup resistor for proper operation. Ground Crystal Connection, Battery Connection 2 of 17 DS1643/DS1643P www.DataSheet4U.c.

DS1644 : PIN PDIP PowerCap NAME 1 32 A14 2 30 A12 3 25 A7 4 24 A6 5 23 A5 6 22 A4 7 21 A3 8 20 A2 9 19 A1 10 18 A0 11 16 DQ0 12 15 DQ1 13 14 DQ2 14 17 GND 15 13 DQ3 16 12 DQ4 17 11 DQ5 18 10 DQ6 19 9 DQ7 20 8 CE 21 28 A10 22 7 OE 23 29 A11 24 27 A9 25 26 A8 26 31 27 6 A13 WE 28 5 -4 VCC RST - 1-3,33,34 NC - X1, X2, VBAT Address Input FUNCTION Data Input/Output Ground Data Input/Output Active Low Chip-Enable Input Address Input Active Low Output-Enable Input Address Input Active-Low Write-Enable Input Power-Supply Input Active-Low Reset Output, Open Drain. Requires a pull-up resistor for proper operation. No Connection Crystal Connection V.

DS1644LPM : The DS1644L is a low profile module that requires a PLCC surface mountable socket a.

DS1644P : PIN PDIP PowerCap NAME 1 32 A14 2 30 A12 3 25 A7 4 24 A6 5 23 A5 6 22 A4 7 21 A3 8 20 A2 9 19 A1 10 18 A0 11 16 DQ0 12 15 DQ1 13 14 DQ2 14 17 GND 15 13 DQ3 16 12 DQ4 17 11 DQ5 18 10 DQ6 19 9 DQ7 20 8 CE 21 28 A10 22 7 OE 23 29 A11 24 27 A9 25 26 A8 26 31 27 6 A13 WE 28 5 -4 VCC RST - 1-3,33,34 NC - X1, X2, VBAT Address Input FUNCTION Data Input/Output Ground Data Input/Output Active Low Chip-Enable Input Address Input Active Low Output-Enable Input Address Input Active-Low Write-Enable Input Power-Supply Input Active-Low Reset Output, Open Drain. Requires a pull-up resistor for proper operation. No Connection Crystal Connection V.

DS1645AB : DS1645Y/AB DS1645Y/AB Partitionable 1024K NV SRAM FEATURES • 10 years minimum data retention in the absence of external power • Data is automatically protected during power loss • Directly replaces 128K x 8 volatile static RAM • Write protects selected blocks of memory when pro- grammed • Unlimited write cycles • Low–power CMOS • Read and write access times as fast as 70 ns • Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time • Full +10% VCC operating range (DS1645Y) • Optional +5% VCC operating range (DS1645AB) • Optional industrial temperature range of –40°C to +85°C, designated IND • JEDEC standard 32–pin DIP package • Low Pro.

DS1645Y : DS1645Y/AB DS1645Y/AB Partitionable 1024K NV SRAM FEATURES • 10 years minimum data retention in the absence of external power • Data is automatically protected during power loss • Directly replaces 128K x 8 volatile static RAM • Write protects selected blocks of memory when pro- grammed • Unlimited write cycles • Low–power CMOS • Read and write access times as fast as 70 ns • Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time • Full +10% VCC operating range (DS1645Y) • Optional +5% VCC operating range (DS1645AB) • Optional industrial temperature range of –40°C to +85°C, designated IND • JEDEC standard 32–pin DIP package • Low Pro.

DS1646P : PIN PDIP PowerCap NAME 1, 30 1, 33, 34 N.C. 23 A16 3 32 A14 4 30 A12 5 25 A7 6 24 A6 7 23 A5 8 22 A4 9 21 A3 10 20 A2 11 19 A1 12 18 A0 25 29 A11 26 27 A9 27 26 A8 28 31 A13 13 16 DQ0 14 15 DQ1 15 14 DQ2 17 13 DQ3 18 12 DQ4 19 11 DQ5 20 10 DQ6 21 9 DQ7 16 17 GND 22 8 CE 23 28 A10 24 7 OE 29 6 WE 31 2 A15 32 5 VCC —4 PFO — X1, X2, VBAT No Connection FUNCTION DS1646/DS1646P Address Input Data Input/Output Ground Active-Low Chip Enable Address Input Active-Low Output Enable Active-Low Write Enable Address Input Power-Supply Input Active-Low Power-Fail Output, Open Drain. Requires a pullup resistor for proper operation. Cry.

DS1647 : PIN PDIP PowerCap 1 34 23 3 32 4 30 5 25 6 24 7 23 8 22 9 21 10 20 11 19 12 18 23 28 25 29 26 27 27 26 28 31 30 33 31 2 13 16 14 15 15 14 17 13 18 12 19 11 20 10 21 9 16 17 22 8 24 7 29 6 32 5 —4 —1 — NAME A18 A16 A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 A10 A11 A9 A8 A13 A17 A15 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 GND CE OE WE VCC PFO N.C. X1, X2, VBAT FUNCTION Address Input Data Input/Output Data Input/Output Ground Active-Low Chip Enable Active-Low Output Enable Active-Low Write Enable Power-Supply Input Active-Low Power-Fail Output, Open Drain. This pin requires a pullup resistor for proper operation. No Connection Crystal Connections and Battery Connection 2 of 12 DS1647/DS1647P DESCRIPTION The .

DS1647P : PIN PDIP PowerCap 1 34 23 3 32 4 30 5 25 6 24 7 23 8 22 9 21 10 20 11 19 12 18 23 28 25 29 26 27 27 26 28 31 30 33 31 2 13 16 14 15 15 14 17 13 18 12 19 11 20 10 21 9 16 17 22 8 24 7 29 6 32 5 —4 —1 — NAME A18 A16 A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 A10 A11 A9 A8 A13 A17 A15 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 GND CE OE WE VCC PFO N.C. X1, X2, VBAT FUNCTION Address Input Data Input/Output Data Input/Output Ground Active-Low Chip Enable Active-Low Output Enable Active-Low Write Enable Power-Supply Input Active-Low Power-Fail Output, Open Drain. This pin requires a pullup resistor for proper operation. No Connection Crystal Connections and Battery Connection 2 of 12 DS1647/DS1647P DESCRIPTION The .

DS1648 : The DS1648 DS3648 and DS1678 DS3678 are quad 2-input multiplexers with TRI-STATE outputs designed to drive the large capacitive loads (up to 500 pF) associated with MOS memory systems A PNP input structure is employed to minimize input currents so that driver loading in large memory systems is reduced The circuit employs Schottkyclamped transistors for high speed and TRI-STATE outputs for bus operation The DS1648 DS3648 has a 15X resistor in series with the outputs to dampen transients caused by the fast-switching output The DS1678 DS3678 has a direct low impedance output for use with or without an external resistor Features Y Y Y Y Y Y TRI-STATE outputs interface directly with system-bus .

DS1649 : The DS1649 DS3649 and DS1679 DS3679 are Hex TRI-STATE MOS drivers with outputs designed to drive large capacitive loads up to 500 pF associated with MOS memory systems PNP input transistors are employed to reduce input currents allowing the large fan-out to these drivers needed in memory systems The circuit has Schottkyclamped transistor logic for minimum propagation delay and TRI-STATE outputs for bus operation The DS1649 DS3649 has a 15X resistor in series with the outputs to dampen transients caused by the fast-switching TRI-STATE is a registered trademark of National Semiconductor Corp output The DS1679 DS3679 has a direct low impedance output for use with or without an external resisto.