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MCF51JE128

An Energy-Efficient Solution from Freescale

Freescale Semiconductor 

Preliminary Electrical Characteristics

3.14 Flash Specifications

This section provides details about program/erase times and program-erase endurance for the Flash

memory.

Program and erase operations do not require any special power sources other than the normal VDD supply.

For more detailed information about program/erase operations, see the Memory chapter in the Reference

Manual for this device (MCF51JE256RM).

Table 23. Flash Characteristics

#

Characteristic

Symbol Minimum Typical Maximum

Unit

C

1

Supply voltage for program/erase

-40C to 105C

Vprog/erase

1.8

—

3.6

V

D

2 Supply voltage for read operation

3 Internal FCLK frequency1

VRead

1.8

—

3.6

V

D

fFCLK

150

—

200

kHz

D

4 Internal FCLK period (1/FCLK)

5 Byte program time (random location)2

6 Byte program time (burst mode)2

7 Page erase time2

8 Mass erase time2

Program/erase endurance3

9

TL to TH = –40C to + 105C

T = 25C

tFcyc

tprog

tBurst

tPage

tMass

5

—

9

4

4000

20,000

10,000

—

—

100,000

6.67

—

—

s

D

tFcyc

P

tFcyc

P

tFcyc

P

tFcyc

P

cycles

C

10 Data retention4

tD_ret

15

100

—

years

C

1 The frequency of this clock is controlled by a software setting.

2 These values are hardware state machine controlled. User code does not need to count cycles. This information supplied for calculating

approximate time to program and erase.

3 Typical endurance for flash was evaluated for this product family on the HC9S12Dx64. For additional information on how Freescale defines

typical endurance, please refer to Engineering Bulletin EB619, Typical Endurance for Nonvolatile Memory.

4 Typical data retention values are based on intrinsic capability of the technology measured at high temperature and de-rated to 25C using

the Arrhenius equation. For additional information on how Freescale defines typical data retention, please refer to Engineering Bulletin EB618,

Typical Data Retention for Nonvolatile Memory.

3.15 USB Electricals

The USB electricals for the USB On-the-Go module conform to the standards documented by the

Universal Serial Bus Implementers Forum. For the most up-to-date standards, visit http://www.usb.org.

If the Freescale USB On-the-Go implementation has electrical characteristics that deviate from the

standard or require additional information, this space would be used to communicate that information.

Table 24. Internal USB 3.3 V Voltage Regulator Characteristics

#

Characteristic

1 Regulator operating voltage

2 VREG output

Symbol Minimum Typical

Maximu

m

Unit

C

Vregin

3.9

—

5.5

V

C

Vregout

3

3.3

3.75

V

P

MCF51JE256 Datasheet, Rev. 4

40

Freescale Semiconductor

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