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| DS1380 DS1380 RAMport FEATURES PIN ASSIGNMENT TOL PF PI1 PO1 PI2 PO2 PI3 PO3 PI4 PO4 PI5 GND 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VCC CLK PO8 PI8 VBAT MEM PO7 PI7 GND PO6 PI6 PO5 * 2K x 8 static RAM * 8-Bit transparent I/O port * Battery connection provided for nonvolatility * Multiplexed address/data bus reduces pin count * 5% or 10% VCC tolerance * Power Fail output signal * Low power CMOS * 24-pin DIP package or optional 24-pin SOIC * Ideally suited for microcontroller applications as add on memory 24-PIN DIP (600 MIL) 24-PIN SOIC (300 MIL) PIN DESCRIPTION PI1 - PI8 PO1 - PO8 PF CLK MEM VBAT VCC GND - - - - - - - - Port Inputs (P Ports) Port Outputs (External Ports) Power Fail Output Clock Memory Select + Battery Connection +5 Volts Ground DESCRIPTION The DS1380 is a 2K x 8 nonvolatile static RAM designed to connect directly to the port pins of a microcontroller. Eight of ten port pins required to interface with the microcontroller are reproduced by the DS1380 for general purpose use. The reproduced port pins can be both inputs and outputs and will appear exactly the same as the pins on the attached microcontroller. The static RAM is read or written with three successive cycles containing high order address, low order address and then data. Read, write and status information is passed to the DS1380 along with the high order address transfer. While transferring data to and from memory, the I/O status is locked and maintained. All data within the DS1380 can be made nonvolatile with direct connection of a 3-volt lithium battery. The DS1380 is controlled by only two signals: clock and memory select. 022598 1/3 DS1380 OPERATION The DS1380 performs exactly to the specifications of the DS1381 with the exception of an external battery connection. The VBAT pin is designed for a battery input voltage between 2.7 volts and 3.5 volts and requires a current of 100 nA at 25C and 1 A at 60C. If battery backup operation is not required, the VBAT input must be grounded. With the external battery connected, the DS1380 is nonvolatile and retains data in the absence of power. When the VBAT input is grounded, the DS1380 is volatile and will not retain data without VCC. For detailed operation and electrical specifications consult the DS1381 data sheet. DS1380S RAMPORT K G PKG DIM A IN. MM B IN. MM C IN. MM D IN. MM E IN. MM F IN. MM G IN. MM C H IN. MM J IN. MM K IN. MM 24-PIN MIN 0.602 15.29 0.290 7.37 0.089 2.26 0.325 8.26 0.008 0.20 0.097 2.46 0.046 1.17 0.400 10.16 0.006 0.152 0.013 0.33 MAX 0.612 15.54 0.300 7.62 0.095 2.41 0.330 8.38 0.012 0.30 0.105 2.68 0.054 1.37 0.410 10.41 0.011 0.28 0.019 0.48 E A B F D J H 3-6 deg. typ. 022598 2/3 DS1380 DS1380 RAMPORT PKG DIM B D A IN. MM B IN. MM 1 A D IN. MM E IN. MM F IN. MM F K G E G IN. MM H IN. MM J IN. MM K IN. MM 0.090 2.29 0.625 15.88 0.008 0.20 0.015 0.38 0.110 2.79 0.675 17.15 0.012 0.30 0.022 0.56 0.600 15.24 0.015 0.380 0.120 3.05 0.625 15.88 0.050 1.27 0.145 3.68 C IN. MM 24-PIN MIN 1.245 31.62 0.530 13.46 0.140 3.56 MAX 1.270 32.25 0.550 13.97 0.160 4.06 C J H 022598 3/3 |
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