DS2401P datasheet, PDF - EEWORLD Datasheet

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DS2401P: DescriptionSecurity ICs / Authentication ICs; Categorystorage storage; File Size376KB，11 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS2401P Overview

Security ICs / Authentication ICs

DS2401P Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	Maxim
Parts packaging code	SOIC
package instruction	3.70 X 4 MM, 1.50 MM HEIGHT, TSOC-6
Contacts	6
Reach Compliance Code	not_compliant
ECCN code	EAR99
JESD-30 code	R-PDSO-C6
JESD-609 code	e0
length	3.94 mm
memory density	64 bit
Memory IC Type	MEMORY CIRCUIT
memory width	1
Humidity sensitivity level	1
Number of functions	1
Number of terminals	6
word count	64 words
character code	64
Operating mode	ASYNCHRONOUS
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
organize	64X1
Package body material	PLASTIC/EPOXY
encapsulated code	SOC
Encapsulate equivalent code	SOC6,.17
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	240
power supply	3/5 V
Certification status	Not Qualified
Maximum seat height	1.5 mm
Maximum supply voltage (Vsup)	6 V
Minimum supply voltage (Vsup)	2.8 V
Nominal supply voltage (Vsup)	5 V
surface mount	YES
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	C BEND
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	20
width	3.76 mm

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19-5860; Rev 5/11

AVAILAB

DS2401

Silicon Serial Number

FEATURES



Upgrade and Drop-In Replacement for

DS2400

Extended 2.8V to 6.0V Range

Multiple DS2401 Devices Can Reside on a

Common 1-Wire



Net

Unique, Factory-Lasered and Tested 64-Bit

Registration Number (8-Bit Family Code +

48-Bit Serial Number + 8-Bit CRC Tester);

Guaranteed No Two Parts Alike

Built-In Multidrop Controller Ensures

Compatibility with Other 1-Wire Net

Products

8-Bit Family Code Specifies DS2401

Communications Requirements to Reader

Presence Pulse Acknowledges When the

Reader First Applies Voltage

Low-Cost TO-92, SOT-223, and TSOC

Surface-Mount Packages

Reduces Control, Address, Data, and Power

to a Single Pin

Zero Standby Power Required

Directly Connects to a Single Port Pin of a

Microprocessor and Communicates at Up to

Functional Diagrams

16.3kbps

TO-92 Tape-and-Reel Version with Leads

Bent to 100-mil Spacing (Default) or with

Straight Leads (DS2401-SL)

-40°C to +85°C Industrial Temperature

Range

PIN CONFIGURATIONS

TO-92

TSOC

DS2401



TOP VIEW



1 2 3

TOP VIEW

BOTTOM VIEW

01rrd

Flip Chip, Top View

with Laser Mark,

Contacts Not Visible.

“rrd” = Revision/Date

PIN DESCRIPTIONS

5, 6

TO-92,

SOT-223

Ground

Data (DQ)

No Connect

Ground*

—

TSOC

Ground

Data (DQ)

No Connect

APPLICATIONS

PCB Identification

Network Node ID

Equipment Registration

*SOT-223

only.

FLIP

CHIP

Data (DQ)

Ground

—

1- Wire is a registered trademark of Maxim Integrated Products, Inc.

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

DS2401

ORDERING INFORMATION

DS2401+

DS2401+T&R

DS2401-SL+T&R

DS2401P+

DS2401P+T&R

DS2401Z+

DS2401Z+T&R

DS2401X1-S#T

PART

+Denotes

a lead(Pb)-free/RoHS-compliant package.

T&R/T = Tape and reel.

SL = Straight leads.

#Denotes a RoHS-compliant device that may include lead that is exempt under the RoHS requirements.

TEMP RANGE

-40°C to +85°C

3 TO-92

3 TO-92 (formed leads)

3 TO-92 (straight leads)

6 TSOC

4 SOT-223

2 Flip Chip (2.5k pieces)

PIN-PACKAGE

DESCRIPTION

The DS2401 enhanced silicon serial number is a low-cost, electronic registration number that provides an

absolutely unique identity which can be determined with a minimal electronic interface (typically, a

single port pin of a microcontroller). The DS2401 consists of a factory-lasered, 64-bit ROM that includes

a unique 48-bit serial number, an 8-bit CRC, and an 8-bit Family Code (01h). Data is transferred serially

via the 1-Wire protocol that requires only a single data lead and a ground return. Power for reading and

writing the device is derived from the data line itself with no need for an external power source. The

DS2401 is an upgrade to the DS2400. The DS2401 is fully reverse-compatible with the DS2400 but

provides the additional multi-drop capability that enables many devices to reside on a single data line.

The familiar TO-92, SOT-223 or TSOC package provides a co mpact enclosure that allows standard

assembly equipment to handle the device easily.

OPERATION

The DS2401’s internal ROM is accessed via a single data line. The 48-bit serial number, 8-bit family

code and 8-bit CRC are retrieved using the Maxim 1-Wire protocol. This protocol defines bus

transactions in terms of the bus state during specified time slots that are initiated on the falling edge of

sync pulses from the bus master. All data is read and written least significant bit first.

The 1-Wire bus is a system which has a single bus master system and one or more slaves. In all instances,

the DS2401 is a slave device. The bus master is typically a microcontroller. The discussion of this bus

system is broken down into three topics: hardware configuration, transaction sequence, and 1-Wire

signaling (signal type and timing).

The 1-Wire bus has only a single line by definition; it is important that each device on the bus be able to

drive it at the appropriate time. To facilitate this, each device attached to the 1-Wire bus must have an

open-drain connection or 3-state outputs. The DS2401 is an open-drain part with an internal circuit

equivalent to that shown in Figure 2. The bus master can be the same equivalent circuit. If a bidirectional

pin is not available, separate output and input pins can be tied together. The bus master requires a pullup

resistor at the master end of the bus, with the bus master circuit equivalent to the one shown in Figure 3.

The value of the pullup resistor should be approximately 5kΩ for short line lengths. A multidrop bus

consists of a 1-Wire bus with multiple slaves attached. The 1-Wire bus has a maximum data rate of

16.3kbits per second.

1-Wire BUS SYSTEM

Hardware Configuration

DS2401

TRANSACTION SEQUENCE



Initialization

ROM Function Command

Read Data

The sequence for accessing the DS2401 via the 1-Wire port is as follows:

All transactions on the 1-Wire bus begin with an initialization sequence. The initialization sequence

consists of a reset pulse transmitted by the bus master followed by a Presence Pulse(s) transmitted by the

slave(s).

The Presence Pulse lets the bus master know that the DS2401 is on the bus and is ready to operate. For

more details, see the 1-Wire Signaling section.

INITIALIZATION

ROM FUNCTION COMMANDS

Once the bus master has detected a presence, it can issue one of the four ROM function commands. All

ROM function commands are 8 bits long. A list of these commands follows (refer to flowchart in Figure

4).

Read ROM [33h] or [0Fh]

This command allows the bus master to read the DS2401’s 8-bit family code, unique 48-bit serial

number, and 8-bit CRC. This command can only be used if there is a single DS2401 on the bus. If more

than one slave is present on the bus, a data collision will occur when all slaves try to transmit at the same

time (open drain will produce a wired-AND result). The DS2401 Read ROM function will occur with a

command byte of either 33h or 0Fh in order to ensure compatibility with the DS2400, which will only

respond to a 0Fh command word with its 64-bit ROM data.

The complete 1-Wire protocol for all Maxim iButtons® contains a Match ROM and a Skip ROM

command. Since the DS2401 contains only the 64-bit ROM with no additional data fields, the Match

ROM and Skip ROM are not applicable and will cause no further activity on the 1-Wire bus if executed.

The DS2401 does not interfere with other 1-Wire parts on a multidrop bus that do respond to a Match

ROM or Skip ROM (for example, a DS2401 and DS1994 on the same bus).

When a system is initially brought up, the bus master might not know the number of devices on the 1-

Wire bus or their 64-bit ROM codes. The search ROM command allows the bus master to use a process

of elimination to identify the 64-bit ROM codes of all slave devices on the bus. The ROM search process

is the repetition of a simple 3-step routine: read a b it, read the complement of the bit, then write the

desired value of that bit. The bus master performs this simple 3-step routine on each bit of the ROM.

After one complete pass, the bus master knows the contents of the ROM in one device. The remaining

number of devices and their ROM codes may be identified by additional passes. Refer to

Application

Note 187: 1-Wire Search Algorithm

for a comprehensive discussion of a ROM search, including an actual

example.

iButton is a registered trademark of Maxim Integrated Products, Inc.

Match ROM [55h] / Skip ROM [CCh]

Search ROM [F0h]

DS2401P Related Products

	DS2401P	DS2401
Description	Security ICs / Authentication ICs	Security ICs / Authentication ICs
Is it Rohs certified?	incompatible	incompatible
Maker	Maxim	Maxim
Parts packaging code	SOIC	TO-92
package instruction	3.70 X 4 MM, 1.50 MM HEIGHT, TSOC-6	TO-92, 3 PIN
Contacts	6	3
Reach Compliance Code	not_compliant	not_compliant
ECCN code	EAR99	EAR99
JESD-30 code	R-PDSO-C6	O-PBCY-T3
JESD-609 code	e0	e0
memory density	64 bit	64 bit
Memory IC Type	MEMORY CIRCUIT	MEMORY CIRCUIT
memory width	1	1
Number of functions	1	1
Number of terminals	6	3
word count	64 words	64 words
character code	64	64
Operating mode	ASYNCHRONOUS	ASYNCHRONOUS
Maximum operating temperature	85 °C	85 °C
Minimum operating temperature	-40 °C	-40 °C
organize	64X1	64X1
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SOC	TO-92
Encapsulate equivalent code	SOC6,.17	SIP3,.1,50
Package shape	RECTANGULAR	ROUND
Package form	SMALL OUTLINE	CYLINDRICAL
Peak Reflow Temperature (Celsius)	240	240
power supply	3/5 V	3/5 V
Certification status	Not Qualified	Not Qualified
Maximum supply voltage (Vsup)	6 V	6 V
Minimum supply voltage (Vsup)	2.8 V	2.8 V
Nominal supply voltage (Vsup)	5 V	5 V
surface mount	YES	NO
technology	CMOS	CMOS
Temperature level	INDUSTRIAL	INDUSTRIAL
Terminal surface	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)
Terminal form	C BEND	THROUGH-HOLE
Terminal pitch	1.27 mm	1.27 mm
Terminal location	DUAL	BOTTOM
Maximum time at peak reflow temperature	20	20

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