Motorola MCM67H618BFN9, MCM67H618BFN10, MCM67H618BFN12 Datasheet

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Advance Information

64K x 18 Bit BurstRAM
Synchronous Fast Static RAM

With Burst Counter and Self–Timed Write

The MCM67H618B is a 1,179,648 bit synchronous fast static random access
memory designed to provide a burstable, high–performance, secondary cache
for the i486 and Pentium microprocessors. It is organized as 65,536 words
of 18 bits, fabricated with Motorola’s high–performance silicon–gate BiCMOS
technology. The device integrates input registers, a 2–bit counter, high speed
SRAM, and high drive capability outputs onto a single monolithic circuit for
reduced parts count implementation of cache data RAM applications. Syn­chronous design allows precise cycle control with the use of an external clock
(K). BiCMOS circuitry reduces the overall power consumption of the integrated
functions for greater reliability .

Addresses (A0 – A15), data inputs (D0 – D17), and all control signals
except output enable (G
edge–triggered noninverting registers.

Bursts can be initiated with either address status processor (ADSP
or address status cache controller (ADSC
burst addresses can be generated internally by the MCM67H618B
(burst sequence imitates that of the i486 and Pentium) and controlled
by the burst address advance (ADV
vide more detailed information on burst controls.

Write cycles are internally self–timed and are initiated by the rising
edge of the clock (K) input. This feature eliminates complex off–chip
write pulse generation and provides increased flexibility for incoming
signals.

Dual write enables (LW
writeable bytes. LW controls DQ0 – DQ8 (the lower bits), while UW
controls DQ9 – DQ17 (the upper bits).

This device is ideally suited for systems that require wide data bus
widths and cache memory . See Figure 2 for applications information.

• Single 5 V

± 5% Power Supply

• Fast Access Times: 9/10/12 ns Max

• Byte Writeable via Dual Write Enables

• Internal Input Registers (Address, Data, Control)

• Internally Self–Timed Write Cycle

• ADSP

, ADSC, and ADV Burst Control Pins

• Asynchronous Output Enable Controlled Three–State Outputs

• Common Data Inputs and Data Outputs

• 3.3 V I/O Compatible

• High Board Density 52–Lead PLCC Package

• ADSP

Disabled with Chip Enable (E) — Supports Address Pipelining

) are clock (K) controlled through positive–

)

) input pins. Subsequent

) input pin. The following pages pro-

and UW) are provided to allow individually

Order this document

by MCM67H618B/D

MCM67H618B

FN PACKAGE

PLASTIC

CASE 778–02

PIN ASSIGNMENT

A6A7E

7654321525150494847
8DQ9
9

DQ10

10

V

CC

11

V

SS

12

DQ11

13

DQ12

14

DQ13

15

DQ14

16

V

SS

17

V

CC

18

DQ15

19

DQ16

20

DQ17

21 22 23 24 25 26 27 28 29 30 31 32 33

A5

A0 – A15 Address Inputs. . . . . . . . . . . . . . . .

K Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ADV
LW
UW
ADSC
ADSP
E
G

DQ0 – DQ17 Data Input/Output. . . . . . . . . .

V

CC

V

SS

All power supply and ground pins must be con­nected for proper operation of the device.

UW

A4A3A2

ADSP

ADSC

LW

A1

A0

V

SS

ADV

CC

V

PIN NAMES

Burst Address Advance. . . . . . . . . . . .

Lower Byte Write Enable. . . . . . . . . . . .

Upper Byte Write Enable. . . . . . . . . . . .

Controller Address Status. . . . . . . . .

Processor Address Status. . . . . . . . .

+ 5 V Power Supply. . . . . . . . . . . . . . . .

K

A15

G

A8A9A10

A13

A14

Chip Enable. . . . . . . . . . . . . . . . . . . . . . . . .

Output Enable. . . . . . . . . . . . . . . . . . . . . .

A12

46
45
44
43
42
41
40
39
38

37
36
35
34

Ground. . . . . . . . . . . . . . . . . . . . . . . . . .

DQ8
DQ7
DQ6
V

CC

V

SS

DQ5
DQ4
DQ3
DQ2
V

SS

V

CC

DQ1
DQ0

A11

i486 and Pentium are trademarks of Intel Corp.

This document contains information on a new product. Specifications and information herein are subject to change without notice.

REV 1
7/15/97

 Motorola, Inc. 1997

MOTOROLA FAST SRAM

MCM67H618B

1

BLOCK DIAGRAM (See Note)

ADV

K

ADSC

ADSP

A0 – A15

UW

LW

E

G

DQ0 – DQ8

DQ9 – DQ17

NOTE: All registers are positive–edge triggered. The ADSC or ADSP signals control the duration of the burst and the start of the

9
9

next burst. When ADSP

ADDRESS

REGISTER

WRITE

REGISTER

ENABLE

REGISTER

and E are sampled low, any ongoing burst is interrupted and a read (independent of W and ADSC)

CLR

is performed using the new external address. Alternatively, an ADSP

BURST LOGIC

Q0

BINARY

COUNTER

Q1

A1 – A0

16

INTERNAL
ADDRESS

A0

′

A0

A1

2

A1

A2 – A15

′

16

18

DATA–IN

REGISTERS

9 9

64K x 18

MEMORY

ARRAY

9

OUTPUT
BUFFER

9

–initiated two cycle WRITE can be performed by

asserting ADSP, E, and a valid address on the first cycle, then negating both ADSP and ADSC and asserting LW and/or

with valid data on the second cycle (see Single Write Cycle in WRITE CYCLES timing diagram). Note that when E and

UW
ADSC are high, ADSP is ignored — the external address is not registered in this case.
When ADSC

is sampled low (and ADSP is sampled high), any ongoing burst is interrupted and a read or write (dependent
on W) is performed using the new external address. Chip enable (E) is sampled only when a new base address is loaded.
After the first cycle of the burst, ADV
is advanced prior to the operation. When ADV

controls subsequent burst cycles. When ADV is sampled low, the internal address

is sampled high, the internal address is not advanced, thus inserting a wait
state into the burst sequence accesses. Upon completion of a burst, the address will wrap around to its initial state. See
BURST SEQUENCE TABLE. Write refers to either or both byte write enables (L W

, UW).

MCM67H618B
2

BURST SEQUENCE TABLE

External Address A15 – A2 A1 A0
1st Burst Address A15 – A2 A1 A0
2nd Burst Address A15 – A2 A1 A0
3rd Burst Address A15 – A2 A1 A0

NOTE: T he burst wraps a round to its initial state upon

completion.

(See Note)

MOTOROLA FAST SRAM

SYNCHRONOUS TRUTH TABLE (See Notes 1, 2, and 3)

E

H X L X X L–H N/A Deselected
L L X X X L–H External Address Read Cycle, Begin Burst
L H L X L L–H External Address Write Cycle, Begin Burst
L H L X H L–H External Address Read Cycle, Begin Burst
X H H L L L–H Next Address Write Cycle, Continue Burst
X H H L H L–H Next Address Read Cycle, Continue Burst
X H H H L L–H Current Address Write Cycle, Suspend Burst
X H H H H L–H Current Address Read Cycle, Suspend Burst
H X H L L L–H Next Address Write Cycle, Continue Burst
H X H L H L–H Next Address Read Cycle, Continue Burst
H X H H L L–H Current Address Write Cycle, Suspend Burst
H X H H H L–H Current Address Read Cycle, Suspend Burst

NOTES:

1. X means Don’t Care.

2. All inputs except G

3. Wait states are inserted by suspending burst.

ADSP ADSC ADV UW or LW K Address Used Operation

must meet setup and hold times for the low–to–high transition of clock (K).

ASYNCHRONOUS TRUTH TABLE (See Notes 1 and 2)

Operation

Read L Data Out
Read H High–Z
Write X High–Z — Data In

Deselected X High–Z

NOTES:

1. X means Don’t Care.

2. For a write operation following a read operation, G
required setup time and held high through the input data hold time.

G I/O Status

must be high before the input data

ABSOLUTE MAXIMUM RATINGS (Voltages Referenced to V

Rating

Power Supply Voltage V
Voltage Relative to VSS for Any Pin

Except V
Output Current (per I/O) I
Power Dissipation P
Temperature Under Bias T
Ambient Temperature T
Storage Temperature T

NOTE: Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are

CC

exceeded. Functional operation should be restricted to RECOMMENDED OPER­ATING CONDITIONS. Exposure to higher than recommended voltages for
extended periods of time could affect device reliability.

Symbol Value Unit

CC

Vin, V

out

bias

A

stg

– 0.5 to VCC + 0.5 V

out

D

= 0 V)

SS

– 0.5 to + 7.0 V

± 30 mA

1.6 W

– 10 to + 85 °C

0 to +70 °C

– 55 to + 125 °C

This device contains circuitry to protect the
inputs against damage due to high static volt­ages or electric fields; however, it is advised that
normal precautions be taken to avoid application
of any voltage higher than maximum rated volt­ages to this high–impedance circuit.

This BiCMOS memory circuit has been
designed to meet the dc and ac specifications
shown in the tables, after thermal equilibrium
has been established.

This device contains circuitry that will
ensure the output devices are in High–Z at
power up.

MOTOROLA FAST SRAM

MCM67H618B

3

DC OPERA TING CONDITIONS AND CHARACTERISTICS

(VCC = 5.0 V ± 5%, TA = 0 to + 70°C, Unless Otherwise Noted)

RECOMMENDED OPERATING CONDITIONS

Parameter

Supply Voltage (Operating Voltage Range) V
Input High Voltage V
Input Low Voltage V

*VIL (min) = – 0.5 V dc; VIL (min) = – 2.0 V ac (pulse width ≤ 20.0 ns) for I ≤ 20.0 mA.

**VIH (max) = VCC + 0.3 V dc; VIH (max) = VCC + 2.0 V ac (pulse width ≤ 20.0 ns) for I ≤ 20.0 mA.

(Voltages Referenced to VSS = 0 V)

Symbol Min Max Unit

CC

IH

IL

4.75 5.25 V

2.2 VCC + 0.3** V

– 0.5* 0.8 V

DC CHARACTERISTICS AND SUPPLY CURRENTS

Parameter Symbol Min Max Unit

Input Leakage Current (All Inputs, Vin = 0 to VCC) I
Output Leakage Current (G = VIH) I
AC Supply Current (Device Selected, All Outputs Open, MCM67H618B–9

Freq = Max) MCM67H618B–10

MCM67H618B–12

CMOS Standby Supply Current (Device Deselected, Freq = 0, VCC = Max,
All Inputs Static at CMOS Levels Vin ≤ VSS + 0.2 V or ≥ VCC – 0.2 V)

Clock Running (Device Deselected, Freq = Max, VCC = Max,
All Inputs Toggling at CMOS Levels Vin ≤ VSS + 0.2 V or ≥ VCC – 0.2 V)

Output Low Voltage (IOL = + 8.0 mA) V
Output High Voltage (IOH = – 4.0 mA) V

NOTE: Good decoupling of the local power supply should always be used. DC characteristics are guaranteed for all possible i486 and Pentium

bus cycles.

lkg(I)

lkg(O)
I

CCA

I

SB2

I

SB4

OL
OH

— ± 1.0 µA
— ± 1.0 µA
— TBD mA

— TBD mA

— TBD mA

— 0.4 V

2.4 3.3 V

CAPACITANCE (f = 1.0 MHz, dV = 3.0 V, T

Parameter

Input Capacitance C
Input/Output Capacitance C

= 25°C, Periodically Sampled Rather Than 100% Tested)

A

Symbol Typ Max Unit

in

I/O

4 5 pF
6 8 pF

MCM67H618B
4

MOTOROLA FAST SRAM