Owner's manual

ManualsBrandsRainbow Electronics ManualsComputer HardwareDS1216

1 of 13 111901

FEATURES

§ Keeps track of hundredths of seconds,

seconds, minutes, hours, days, date of the

month, months, and years

§ Converts standard 2k x 8 up to 512k x 8

CMOS static RAMs into nonvolatile memory

§ Embedded lithium energy cell maintains

watch information and retains RAM data

§ Watch function is transparent to RAM

operation

§ Month and year determine the number of days

in each month; leap-year compensation valid

up to 2100

§ Lithium energy source is electrically

disconnected to retain freshness until power is

applied for the first time

§ Proven gas-tight socket contacts

§ Full ±10% operating range

§ Operating temperature range: 0°C to +70°C

§ Accuracy is better than ±1 minute/month @

+25°C

ORDERING INFORMATION

DS1216B, DS1216C, DS1216D, DS1216E,

DS1216F, DS1216H (See Figure 2 for letter suffix

marking identification.)

PIN DESCRIPTION

RST - RESET

DQ0 - Data Input/Output 0 [RAM]

A2 - Address Bit 2 (Read/Write [ROM])

A0 - Address Bit 0 (Data Input [ROM])

GND - Ground

CE - Conditioned Chip Enable

OE - Output Enable

WE - Write Enable

Vcc - Switched V

for 28-/32-Pin RAM

B - Switched V

for 24-Pin RAM

D - Switched V

for 28-Ppin RAM

PART RAM/ROM RAM DENSITY

PCB MODIFICATION REQUIRED

FOR DENSITY UPGRADE?

DS1216B RAM 16k/64k No/Yes

DS1216C RAM 64k/256k No

DS1216D RAM 256k/1M No/Yes

DS1216E ROM 64k/256k No

DS1216F ROM 64k/256k/1M No

DS1216H RAM 1M/4M No

DS1216

SmartWatch RAM DS1216B/C/D/H

SmartWatch ROM DS1216E/F

www.maxim-ic.com

DS1216B/C/D/E

28-Pin Intelli

ent Socket

[A2]

[

]

DQ0

GND

RST 1 28 V

Summary of content (13 pages)

PAGE 1
DS1216 SmartWatch RAM DS1216B/C/D/H SmartWatch ROM DS1216E/F www.maxim-ic.
PAGE 2
DS1216 TYPICAL OPERATING CIRCUIT RST [A2] [A0] DQ0 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 VCC WE OE CE DS1216D/E/F/H 32-Pin Intelligent Socket DESCRIPTION The DS1216 SmartWatch RAM and SmartWatch ROM Sockets are 600mil-wide DIP sockets with a built-in CMOS watch function, an NV RAM controller circuit, and an embedded lithium energy source.
PAGE 3
DS1216 After the pattern match, the next 64 reads and/or writes are directed to the clock, and the RAM is disabled. Once the pattern is established, the next 64 read/write cycles will be directed to the RTC registers. When power is cycled, 64 reads should be executed prior to any writes to ensure that the RTC registers are not written. A pattern match is ignored if the RST bit is zero and the RST pin goes low during the match sequence.
PAGE 4
DS1216 SMARTWATCH COMPARISON REGISTER DEFINITION Figure 1 HEX VALUE BYTE 0 7 1 1 0 0 0 1 0 0 1 BYTE 1 0 0 1 1 1 0 1 0 3A BYTE 2 1 0 1 0 0 0 1 1 A3 BYTE 3 0 1 0 1 1 1 0 0 5C BYTE 4 1 1 0 0 0 1 0 1 C5 BYTE 5 0 0 1 1 1 0 1 0 3A BYTE 6 1 0 1 0 0 0 1 1 A3 BYTE 7 0 1 0 1 1 1 0 0 C5 5C Note: The pattern recognition in Hex is C5, 3A, 5C, C5, 3A, A3, 5C.
PAGE 5
DS1216 SMARTWATCH REGISTER INFORMATION The SmartWatch information is contained in eight registers of 8 bits, each of which is sequentially accessed one bit at a time after the 64-bit pattern recognition sequence has been completed. When updating the SmartWatch registers, each must be handled in groups of 8 bits. Writing and reading individual bits within a register could produce erroneous results. These read/write registers are defined in Figure 3.
PAGE 6
DS1216 RESET AND MEMORY DENSITY OPTIONS Figure 2 The letter suffix of the SmartWatch is located on the PCB as shown above. The RESET pin on the controller has an internal pullup resistor. To disable the RESET function, the trace between pin 1 on the socket and pin 13 on the controller can be cut. In this case, the socket will ignore the RESET input, preventing address transitions from resetting the pattern match, even if the RST bit is enabled.
PAGE 7
DS1216 SMARTWATCH REGISTER DEFINITION Figure 3 REGISTER 7 0 0.1 SEC 0 0.
PAGE 8
DS1216 ABSOLUTE MAXIMUM RATINGS* Voltage Range on any Pin Relative to Ground Operating Temperature Range Storage Temperature Range Soldering Temperature Range -0.3V to +7.0V for 5V 0°C to +70°C -40°C to +70°C See J-STD-020A Specification (Note 6) * This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operation sections of this specification is not implied.
PAGE 9
DS1216 CAPACITANCE PARAMETER Input Capacitance Output Capacitance (TA = +25°C) SYMBOL MIN TYP MAX UNITS CIN 5 pF COUT 7 pF NOTES (TA = +25°C) PARAMETER Expected Data Retention SYMBOL MIN tDR AC ELECTRICAL CHARACTERISTICS PARAMETER TYP MAX UNITS NOTES 10 Years 14 (0°C to 70°C; VCC = 4.5 to 5.
PAGE 10
DS1216 TIMING DIAGRAM: READ CYCLE TO SMARTWATCH TIMING DIAGRAM: WRITE CYCLE TO SMARTWATCH TIMING DIAGRAM: RESET FOR SMARTWATCH 10 of 13
PAGE 11
DS1216 TIMING DIAGRAM: POWER-DOWN TIMING DIAGRAM: POWER-UP Warning: Under no circumstances should negative undershoots of any amplitude be allowed when the device is in battery-backup mode. Water washing for flux removal will discharge internal lithium source because exposed voltage pins are present.
PAGE 12
DS1216 NOTES: 1) Pin locations are designated “U” when a parameter definition refers to the socket receptacle and “L” when a parameter definition refers to the socket pin. 2) No memory inserted in the socket. 3) Pin 26L can be connected to VCC or left disconnected at the PC board. 4) SmartWatch sockets can be successfully processed through some conventional wave-soldering techniques as long as temperature exposure to the lithium energy source contained within does not exceed +85°C.
PAGE 13
DS1216 DS1216 28 SMARTWATCH PKG DIM A IN. MM B IN. MM C IN. MM D IN. MM E IN. MM F IN. MM G IN. MM H IN. MM J IN. MM K IN. MM L IN. MM 13 of 13 28-PIN 32-PIN MIN MAX MIN MAX 1.390 1.420 1.580 1.620 35.31 36.07 40.13 41.14 0.690 0.720 0.690 0.720 17.53 18.29 17.53 18.29 0.420 0.470 0.400 0.470 10.67 11.94 10.16 11.94 0.035 0.065 0.035 0.065 0.89 1.65 0.89 1.65 0.055 0.075 0.055 0.075 1.39 1.90 1.39 1.90 0.120 0.160 0.120 0.160 3.04 4.06 3.04 4.06 0.090 0.110 0.090 0.110 2.29 2.79 2.29 2.79 0.590 0.630 0.