M48Z08 STMICROELECTRONICS | Alldatasheet
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Technical content
64 Kbit (8Kb x 8) ZEROPOWER® SRAM
INTEGRATED ULTRA LOW POWER SRAM, POWER-FAIL CONTROL CIRCUIT and BATTERY UNLIMITED WRITE CYCLES READ CYCLE TIME EQUALS WRITE CYCLE TIME AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION WRITE PROTECT VOLTAGES PFD = Power-fail Deselect Voltage): – M48Z08: 4.50V ≤ VPFD ≤ 4.75V – M48Z18: 4.20V ≤ VPFD ≤ 4.50V SELF-CONTAINED BATTERY in the CAPHAT DIP PACKAGE PACKAGING INCLUDES a 28 LEAD SOIC and SNAPHAT ® TOP (to be Ordered Separately) SOIC PACKAGE PROVIDES DIRECT CONNECTION for a SNAPHAT TOP which CONTAINS the BATTERY PIN and FUNCTION COMPATIBLE with the DS1225 and JEDEC STANDARD 8K x 8 SRAMs
DESCRIPTION
® RAM is an 8K x 8 non-volatile static RAM which is pin and func- tional compatible with the DS1225. The monolithic chip is available in two special packages to provide a highly integrated battery backed-up memory so- lution. AI01022 A0-A12 W DQ0-DQ7 VCC M48Z08 M48Z18 G VSS E Figure 1. Logic Diagram Table 1. Signal Names
- Negative spikes of –1V allowed for up to 10ns once per cycle.
Table 6. DC Characteristics Notes:1. Effective capacitance measured with power supply at 5V.
- Sampled only, not 100% tested.
Table 5. Capacitance (1, 2) Note: 1. All voltages referenced to VSS . Table 7. Power Down/Up Trip Points DC Characteristics (1) For the 28 lead SOIC, the battery package (i.e. SNAPHAT) part number is "M4Z28-BR00SH1". single 5V supply for an out of tolerance condition.
- VPFD (min) to VSO fall time of less than tFB may cause corruption of RAM data.
Table 8. Power Down/Up Mode AC Characteristics Figure 5. Power Down/Up Mode AC Waveforms reset is being applied to the processor, a reset condition may not occur until after the system clock is running.
Notes:1. CL = 100pF (see Figure 4).
- CL = 30pF (see Figure 4).
Table 9. Read Mode AC Characteristics Figure 6. Read Mode AC Waveforms Note: Write Enable (W) = High.
Notes:1. CL = 30pF (see Figure 4).
- If E goes low simultaneously with W going low, the outputs remain in the high impedance state.
Table 10. Write Mode AC Characteristics (Write Enable) is high and E (Chip Enable) is low. one of the 8,192 bytes of data is to be accessed. ELQV ) or Output Enable Access time (tGLQV ). from the latter occurring falling edge of W or E. disable the outputs tWLQZ after W falls.
state, provided the VCC fall time is not less than tF. and the power supply is switched to external VCC . to the Application Note AN1012. Figure 9. Predicted Battery Storage Life versus Temperature
ORDERING INFORMATION SCHEME Supply Voltage and Write Protect Voltage 08 (1)VCC = 4.75V to 5.5V VPFD = 4.5V to 4.75V 18 VCC = 4.5V to 5.5V VPFD = 4.2V to 4.5V Speed -100 100ns Package PC PCDIP28 MH (2,3)SOH28 Temp. Range 1 0 to 70 °C 6 (4) –40 to 85 °C Shipping Method for SOIC blank Tubes TR Tape &Reel Example: M48Z18 -100 MH 1 TR Notes: 1. The M48Z08 part is offered with the PCDIP28 (i.e. CAPHAT) package only. 2. The SOIC package (SOH28) requires the battery package (SNAPHAT) which is ordered separately under the part number "M4Z28-BR00SH1" in plastic tube or "M4Z28-BR00SH1TR" in Tape & Reel form. 3. Delivery may include either the 2-pin version of the SOIC/SNAPHAT or the 4-pin version of the SOIC/SNAPHAT. Both are functionally equivalent (see package drawing section for details). 4. Temperature range available for M48Z18 product only. Caution:Do not place the SNAPHAT battery package "M4Z28-BR00SH1" in conductive foam since this will drain the lithium button-cell battery. For a list of available options (Speed, Package, etc...) or for further information on any aspect of this device, please contact the STMicroelectronics Sales Office nearest to you. M48Z08, M48Z18
A L B1 B e1 D E N C eA Symb mm inches Typ Min Max Typ Min Max A 8.89 9.65 0.350 0.380 A1 0.38 0.76 0.015 0.030 A2 8.38 8.89 0.330 0.350 B 0.38 0.53 0.015 0.021 B1 1.14 1.78 0.045 0.070 C 0.20 0.31 0.008 0.012 D 39.37 39.88 1.550 1.570 E 17.83 18.34 0.702 0.722 e1 2.29 2.79 0.090 0.110 e3 29.72 36.32 1.170 1.430 eA 15.24 16.00 0.600 0.630 L 3.05 3.81 0.120 0.150 N2 8 2 8 Drawing is not to scale. PCDIP28 - 28 pin Plastic DIP, battery CAPHAT M48Z08, M48Z18
E N D C LA1 α H A CP Be eB Symb mm inches Typ Min Max Typ Min Max A 3.05 0.120 A1 0.05 0.36 0.002 0.014 A2 2.34 2.69 0.092 0.106 B 0.36 0.51 0.014 0.020 C 0.15 0.32 0.006 0.012 D 17.71 18.49 0.697 0.728 E 8.23 8.89 0.324 0.350 e1 . 2 7– – 0 . 0 5 0 – – eB 3.20 3.61 0.126 0.142 H 11.51 12.70 0.453 0.500 L 0.41 1.27 0.016 0.050 α 0° 8° 0° 8° N2 8 2 8 CP 0.10 0.004 Drawing not to scale. SOH28 - 28 lead Plastic Small Outline, 4-socket battery SNAPHAT M48Z08, M48Z18
E N D C LA1 α H A CP Be eB Symb mm inches Typ Min Max Typ Min Max A 3.05 0.120 A1 0.05 0.36 0.002 0.014 A2 2.34 2.69 0.092 0.106 B 0.36 0.51 0.014 0.020 C 0.15 0.32 0.006 0.012 D 17.71 18.49 0.697 0.728 E 8.23 8.89 0.324 0.350 e1 . 2 7– – 0 . 0 5 0 – – eB 3.20 3.61 0.126 0.142 H 11.51 12.70 0.453 0.500 L 0.41 1.27 0.016 0.050 α 0° 8° 0° 8° N2 8 2 8 CP 0.10 0.004 Drawing not to scale. SOH28 - 28 lead Plastic Small Outline, 2-socket battery SNAPHAT M48Z08, M48Z18
D E eA eB B L Symb mm inches Typ Min Max Typ Min Max A 9.78 0.385 A1 6.73 7.24 0.265 0.285 A2 6.48 6.99 0.255 0.275 A3 0.38 0.015 B 0.46 0.56 0.018 0.022 D 21.21 21.84 0.835 0.860 E 14.22 14.99 0.560 0.590 eA 15.55 15.95 0.612 0.628 eB 3.20 3.61 0.126 0.142 L 2.03 2.29 0.080 0.090 SH - 4-pin SNAPHAT Housing for 49 mAh Battery Drawing not to scale. M48Z08, M48Z18
D E eB B L Symb mm inches Typ Min Max Typ Min Max A 9.78 0.385 A1 6.73 7.24 0.265 0.285 A2 6.48 6.99 0.255 0.275 A3 0.38 0.015 B 0.46 0.56 0.018 0.022 D 21.21 21.84 0.835 0.860 E 14.22 14.99 0.560 0.590 eB 3.20 3.61 0.126 0.142 L 2.03 2.29 0.080 0.090 SH - 2-pin SNAPHAT Housing for 49 mAh Battery Drawing not to scale. M48Z08, M48Z18
D E eB B L Symb mm inches Typ Min Max Typ Min Max A 10.54 0.415 A1 8.00 8.51 0.315 0.335 A2 7.24 8.00 0.285 0.315 A3 0.38 0.015 B 0.46 0.56 0.018 0.022 D 21.21 21.84 0.835 0.860 E 17.27 18.03 0.680 0.710 eB 3.20 3.61 0.126 0.142 L 2.03 2.29 0.080 0.090 SH - 2-pin SNAPHAT Housing for 130 mAh Battery Drawing not to scale. M48Z08, M48Z18
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics © 1999 STMicroelectronics - All Rights Reserved ® TIMEKEEPER and SNAPHAT are registered trademarks of STMicroelectronics CAPHAT and BYTEWIDE are trademarks of STMicroelectronics All other names are the property of their respective owners STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com M48Z08, M48Z18