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Part numbering M41T256Y
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7 Part numbering
Table 13. Ordering information scheme
Caution: Do not place the SNAPHAT battery package “M4TXX-BR12SH” in conductive foam as it will
drain the lithium button-cell battery.
For other options, or for more information on any aspect of this device, please contact the
ST sales office nearest you.
Table 14. SNAPHAT
®
battery table
Example: M41T 256Y MT 7 E
Device type
M41T
Supply voltage and write protect voltage
256Y = V
CC
= 4.5 to 5.5V; V
PFD
= 4.2 to 4.5V
Package
MH
(1)
= SOH44
1. The SOIC package (SOH44) requires the SNAPHAT
®
battery package which is ordered separately under the part
number “M4Txx-BR12SH” in plastic tubes (see Table 14).
Temperature range
7 = –25 to 70°C
Shipping method
E = Lead-free package (ECOPACK
®
), tubes
F = Lead-free package (ECOPACK
®
), tape & reel
Part Number Description Package
M4T32-BR12SH Lithium battery (120mAh) SNAPHAT SH
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M41T256Y Revision history
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8 Revision history
Table 15. Document revision history
Date Version Revision Details
February 2002 1.0 First Issue
26-Apr-02 1.1 Addition of “Tamper Event Time-Stamp” text
31-May-02 1.2
Add Sleep Mode, 44-pin with SNAPHAT package (Figure 2, 5, 19, 20;
Ta bl e 1, 5, 14, 15, 12, 13).
03-Jul-02 1.3 Modify Crystal Electrical Characteristics table footnotes (Table 9).
12-Jul-02 1.4
Added programmable Sleep Mode information to document (Figure 3, 4,
5, 6; Table 3, 4)
29-Jul-02 1.5 Add “Hatless” to package description (Figure 1,18) and Table 14, 11)
20-Dec-02 2.0
I
CC
Characteristics changed (Table 8); Document promoted to
“Datasheet”
04-Jan-03 2.1 Add V
OL
value (Table 8)
26-Mar-03 2.2 Update test condition (Table 10)
15-Jun-04 3.0
Reformatted; add Lead-free information; update characteristics (Figure
14; Table 5, 14)
16-Apr-2007 4
Reformatted document. Updated packaging references that only 44-lead
SNAPHAT available (cover page, Summary, Figure 1, Tabl e 1, Tabl e 13 ).
Updated Ta bl e 9 , 10.
09-Nov-2007 5
Added lead-free second level interconnect information to cover page and
Section 6: Package mechanical data; product status “Not for New
Design”; updated Ta bl e 1 3.
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M41T256Y
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M41T256YMH7F

Mfr. #:
Manufacturer:
STMicroelectronics
Description:
IC RTC CLK/CALENDAR I2C 44-SOH
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

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