ETC VM355630

Value The Customer™
VM3500
4, 6 or 8-CHANNEL, 5-VOLT,
THIN-FILM HEAD, READ/WRITE
PREAMPLIFIER with MULTIPLE
SERVO WRITE CAPABILITY
980624
FEATURES
June 24, 1998
BLOCK DIAGRAM
V ,M3
4
6 , 500
or 8 -C ha nn el, PE CL or T T L WD I, S ervo W rite , Ve ry H igh Pe rfo rm an ce
• General
• High Performance Reader
- Read Gain = 300 V/V Typical
- Input Noise = 0.5nV/ÐHz Typical
- Low Input Capacitance = 8 pF Typical
VCC
R/W
CS
GND
Mode
Select
H0X
Read Buffer
H0Y
Read Preamp
H1X
RDX
H1Y
RDY
H2X
WDI
WDI
Write Current
Switch
Multiplexer
- Single Power Supply (5 V ± 10%)
- Power Up/Down Data Protect Circuitry
- Very Low Power Dissipation
(3 mW Typical in Sleep Mode)
- Reduced Write-to-Read Recovery Time
- Head Inductance Range = 0.2 – 1 µH (0.54 µH Typical)
- Write Unsafe Detection
- Available in 4, 6 or 8 Channels
H2Y
H3X
H3Y
H4X
WC
Write Current
Source
H4Y
H5X
• High Speed Writer
- Write Current Range 5 - 25 mA
- IW Rise/Fall Times = 3.3 ns
(LH = 0.54 µH, IW = 10 mA b-p)
- PECL or TTL Write Data Inputs
- Multi-Channel Servo Write
- Write Current Range (Servo) 5 - 20 mA
- Optional Write Data Flip-Flop
DESCRIPTION
The VM3500 is a high-performance read/write preamplifier
designed for use in high-end disk drives. It provides write current
control, data protection circuitry, and a low-noise read
preamplifier for up to eight channels.
Fault protection is provided so that during power supply
sequencing the write current generator is disabled. System
write-to-read recovery time is minimized by maintaining the read
channel common-mode output voltage in write mode.
Very low-power dissipation from the +5V supply is achieved
through use of high-speed bipolar processing and innovative
circuit design techniques. When unselected, the device enters a
sleep mode, with power dissipation reduced to less than 3mW.
In multi-channel servo write mode, all heads are written
simultaneously. The servo mode is activated via the WUS line.
The VM3500 is available in several different packages. Please
contact VTC for package availability.
HS0
HS1
Head Select
DIS
HS2
WUS
H5Y
S0
S1
H6X
SWA
H7X
Servo Write
H6Y
H7Y
ABSOLUTE MAXIMUM RATINGS
Power Supply:
V CC ……………………………………………………… -0.3V to +7V
30mA
Write Current, IW
Input Voltages:
Digital Input Voltage, VIN ………………… -0.3V to (VCC + 0.3)V
Head Port Voltage, VH …………………… -0.3V to (VCC + 0.3)V
WUS Pin Voltage Range, VWUS ……………………… -0.3V to +6V
Output Current:
RDX, RDY: lO ……………………………………………… -10mA
WUS: lWUS ………………………………………………… +12mA
Junction Temperature ……………………………………… 150°C
Storage Temperature, Tstg ………………………… -65° to 150°C
Thermal Characteristics, ΘJA:
20-lead SOIC ……………………………………………… 90°C/W
20-lead SSOP …………………………………………… 110°C/W
24-lead SSOP …………………………………………… 100°C/W
32-lead VSOP …………………………………………… 100°C/W
RECOMMENDED OPERATING CONDITIONS
Power Supply Voltage:
V CC ……………………………………………………… +5V ± 10%
Write current, IW …………………………………………… 5 to 25mA
Head Inductance, LH …………………………………… 0.2 to 1µH
Junction Temperature, TJ …………………………… 25°C to 125°C
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
2-1
2 - TERMINAL
5V/12V PREAMPS
VTC Inc.
VM3500
980624
selected.
CIRCUIT OPERATION
2 - TERMINAL
5V/12V PREAMPS
The VM3500 addresses up to eight two-terminal thin-film
heads, providing write drive or read amplification. Mode control
is accomplished with pins CS and R/W as shown in Table 1.
Head selection is accomplished with pins HS0, HS1 and HS2 as
shown in Table 2.
Internal pull-up resistors provided on pins CS and R/W force
the device into a non-writing condition if either control line is
opened accidentally.
Write Mode
The write mode configures the VM3500 as a write current
switch with the write current toggled between the X and Y side
of the selected head in response to transitions on the WDI/WDI
PECL inputs. The write unsafe (WUS) detection circuitry is also
activated at this time to drive the output to a low (Safe) condition.
VM3500: Write current is toggled on each low to high transition
of WDI/WDI. A preceding read operation initializes the write data
flip flop (WDFF) so that upon entering the write mode current
flows into the “X” port.
VM3500F: For the VM3500F (without the WDFF), the write
current polarity is defined by the levels of WDI/WDI. For WDI >
WDI, current flows into the “X” port; for WDI < WDI, current flows
into the “Y” port.
An internally-generated 2.5 V reference voltage is present at
the WC pin. The write current magnitude is determined by an
external resistor connected between the WC pin and ground and
is defined by the equation:
KW
50
I W =  ------------ + 0.3mA =  ------------ + 0.3mA
 R WC
 R WC
(eq. 1)
To return to normal operations:
1. Enter read mode (bring R/W high).
2. Drop the WUS pin (remove the 10 mA current) and return to
normal read mode.
Read Mode
The read mode configures the VM3500 as a low-noise
differential amplifier. The write current reference remains active
to minimize the write/read recovery time. The RDX and RDY
outputs are emitter followers and are in phase with the “X” and
“Y” head ports. These outputs should be AC-coupled to the load.
The RDX, RDY common-mode voltage is maintained in the
write mode, minimizing the transient between the write mode
and the read mode, thereby substantially reducing the recovery
time delay to the subsequent pulse detection circuitry.
Sleep Mode
In sleep mode (CS high), most of the circuit is idle and power
dissipation is reduced to 3mW typical.
Table 1 Mode Select
R/W
CS
MODE
0
0
Write
0
0
Servo*
1
0
Read
X
1
Idle
* See (Multi-Channel Servo Write Mode on page 2)
for additional detail.
(0-peak ±10%)
Power supply fault protection improves data security by
disabling the write current generator during a voltage fault or
power-up. Additionally, the write unsafe circuitry will flag any of
the conditions below as a high level on the open collector output
pin WUS:
• No write current
• WDI frequency too low
• Device in read or sleep mode
Two transitions on pin WDI, after the fault is corrected, may be
required to clear the WUS flag.
Multi-Channel Servo Write Mode
In servo write mode, the operation is the same as described
above except that all channels are written simultaneously. Servo
mode is controlled using the WUS pin.
Table 2 Head Selection
HS2
HS1
HS0
HEAD
0
0
0
0
0
0
1
1
0
1
0
2
0
1
1
3
1
0
0
4
1
0
1
5
1
1
0
6
1
1
1
7
To initiate servo mode:
1. Enter read mode (bring R/W high).
2. Select Head 1 (bring HS0 high).
3. Supply 10mA source current into the WUS pin.
4. Enter servo mode (drop the R/W line low).
Note: If any other head is selected during servo, the part will
exit servo mode and write only the selected head.
Unless servo is “formally” exited by removing the 10mA
current, servo mode will return whenever head 1 is
2-2
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
VM3500
980624
NAME
I/O
HS0 - HS2
I1
Head Selects:
Selects one of up to eight heads.
H0X - H7X
H0Y - H7Y
I/O
X, Y Head Terminals
I1
Write Data Inputs:
PECL input signal; a rising edge toggles
direction of head current.
(Each transition toggles the direction of
head current on the “F” option without
the write data flip flop.)
WDI, WDI
DESCRIPTION
I
R/W
I1
Read/Write select:
A high level selects read mode.
A low-level selects write mode
O1
Write Unsafe/Servo Enable:
(open collector output)
A high level indicates a writes unsafe
condition.
Note: The WUS pin is also used to
enter servo mode.
See (Multi-Channel Servo Write
Mode on page 2).
Head
345Ω
Write
Amp
Write Current Adjust:
A resistor adjusts level of write current.
WC
RDX-RDY
Read
Amp
Chip Select:
A high level signal puts chip in sleep
mode; a low level awakens chip.
CS
WUS/SE
Damping Resistor
Unless otherwise indicated, the VM3500 has damping
resistors isolated by Schottky diodes. The diodes effectively
remove the resistor from the circuit during the read mode,
however during the write mode with the higher level input signal,
the resistor provides damping for the write current waveform.
2 - TERMINAL
5V/12V PREAMPS
PIN DESCRIPTIONS
O
Read Data Output:
Differential output data.
VCC
+5 volt supply
GND
Ground
1. May be wire-OR’ed for multi-chip usage.
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
2-3
VM3500
980624
DC CHARACTERISTICS
Recommended operating conditions apply unless otherwise specified.
PARAMETER
Power Supply Voltage
SYM
Power Supply Power Dissipation
MIN
TYP
MAX
UNITS
4.5
5.0
5.5
V
Read Mode
34 +
0.05IW
50
Write Mode, Normal, IW =
10mA
34 +
1.05IW
60
Write Mode, Servo, IW = 10mA
(4-Channel)
55 + 4.3IW
125
Write Mode, Servo, IW = 10mA
(6-Channel)
100 +
8.6IW
225
Write Mode, Servo, IW = 10mA
(8-Channel)
100 +
8.6IW
225
Sleep Mode
0.5
3
Read Mode
175
275
Write Mode, Normal, IW =
10mA
225
330
Write Mode, Servo, IW = 10mA
(4-Channel)
490
688
VCC
2 - TERMINAL
5V/12V PREAMPS
VCC Supply Current
CONDITIONS
ICC
mA
PD
mW
Write Mode, Servo, IW = 10mA
(6-Channel)
930
1240
Write Mode, Servo, IW = 10mA
(8-Channel)
930
1240
3
16.5
Sleep Mode
Input High Voltage
VIH
2
VCC +0.3
V
Input Low Voltage
VIL
-0.3
0.8
V
Input High Current
IIH
VIH = 2.7V
80
µA
Input Low Current
IIL
VIL = 0.4V
WDI, WDI Input High Voltage
VIH
Pseudo ECL
VCC - 1.5
VCC - 0.1
V
WDI, WDI Input Low Voltage
VIL
Pseudo ECL
VIH - 1.5
VIH - 0.25
V
WDI, WDI Input High Current
IIH
VIH = VCC - 0.7V
100
µA
WDI, WDI Input Low Current
IIL
VIH = VCC - 1.6V
80
µA
-160
µA
WUS Output Low Voltage
VOL
IOL = 4.0mA
0.35
0.5
V
WUS Output High Current
IOH
VOH = 5.0V
13
100
µA
3.3
3.6
4.0
V
10
1
20
mA
VCC Value for Write Current
Turn Off
WUS Servo Enable
IH < 0.2mA
ISE
1. The typical value for servo activation is 6 mA. The minimum value at which servo activation is guaranteed is 10 mA.
2-4
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
VM3500
980624
WRITE CHARACTERISTICS
Recommended operating conditions apply unless otherwise specified; LH = 0.54µH, RH = 20¾, IW = 10mA, fDATA = 5MHz.
PARAMETER
WC Pin Voltage
2 - TERMINAL
5V/12V PREAMPS
1.
SYM
CONDITIONS
MIN
TYP 1
MAX
UNITS
VWC
2.5
V
IWC to Head Current Gain
AI
20
mA/mA
Write Current Constant
KW
VCC = 5V ±10%
45
Write Current Range
IW
10.64k¾ > RWC > 2k¾
50
55
V
5
25
mA
Write Current Tolerance
∆IW
VCC ±10%
-10
+10
%
Write Current Tolerance Servo
∆IW
VCC ±10%
-14
+14
%
Differential Head Voltage Swing
VDH
Open head @ VCC = 4.5V
5.4
WDI Transition Frequency for Safe
Condition
fDATA
WUS = low
Differential Output Capacitance
COUT
Differential Output Resistance
ROUT
Unselected Head Current
IUH
RDX, RDY Common Mode Output
Voltage
VCM
6.0
Vp-p
1
MHz
10
3.2
IW = 25mA
pF
k¾
0.15
0.5
VCC - 2.7
mA(pk)
V
Typical values are given at VCC = 5V and TA = 25°C.
SERVO WRITE
PARAMETER
Write Current Matching Between
Channels
Duty Cycle (20mA/head)
SYM
∆IW
CONDITIONS
MIN
TYP
MAX
UNITS
5mA < IW < 20mA
10
%
TA = 25°C, t s-on < 50ns 1
50
%
1. The ambient temperature (TA) and servo-on time (ts-on) limitations are consistent with keeping the peak junction temperature under 125°C.
2-5
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
VM3500
980624
READ CHARACTERISTICS
Recommended operating conditions apply unless otherwise specified; CL (RDX, RDY) < 20pF, RL (RDX, RDY) = 1k¾.
PARAMETER
2 - TERMINAL
5V/12V PREAMPS
Differential Voltage Gain
AV
Bandwidth
BW
TYP 1
MAX
UNITS
VIN = 1mVrms, 1MHz
250
300
350
V/V
-1dB |Zs| < 5¾, VIN = 1mVp-p
50
55
-3dB |Zs| < 5¾, VIN = 1mVp-p
90
100
CONDITIONS
MHz
Input Noise Voltage
ein
BW = 20MHz, LH = 0, RH = 0
Differential Input Capacitance
CIN
VIN = 1mVp-p, f = 5MHz
Differential Input Resistance
RIN
VIN = 1mVp-p, f = 5MHz
Dynamic Range
DR
AC input where AV is 90% of gain
at 0.2mVrms input
2
mV P-P
300
0.5
0.65
nV/ÐHz
8
12
pF
750
¾
Common Mode Rejection Ratio
CMRR
VIN = 100mVp-p @ 5MHz
50
dB
Power Supply Rejection Ratio
PSRR
100mVp-p @ 5MHz on VCC
45
dB
45
dB
Channel Separation
CS
Unselected channels:
VIN = 20mVp-p @ 5MHz
VIN = 0 on selected head
Output Offset Voltage
VOS
Steady state read
RDX, RDY Common Mode Output
Voltage
VOCM
Read/Write Mode
RDX, RDY Common Mode Output
Voltage Difference Between Modes
∆VOCM
Single-Ended Output Resistance
Output Current
1.
MIN
SYM
RSEO
IO
-300
+300
mV
+350
mV
35
¾
VCC - 2.0
-350
f = 5 MHz
AC-coupled load, RDX to RDY
±1
mA
Typical values are given at VCC = 5V and TA = 25°C.
2-6
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
VM3500
980624
SWITCHING CHARACTERISTICS
Recommended operating conditions apply unless otherwise specified; IW = 10mA, fDATA = 5MHz, LH = 0.54µH, RH = 20¾,
CL (RDX, RDY) ð 20pF (see Figures 1 and 2).
SYM
CONDITIONS
TYP 1
MAX
UNITS
R/W Read to Write Delay
tRW
R/W to 90% IW
0.06
0.15
µs
R/W Write to Read Delay
tWR
R/W to 90% of 100mV, 10 MHz
read signal envelope
0.2
0.4
µs
CS Unselect to Select Delay
tIR
CS to 90% I W or 90% of 100mV,
10MHz read signal envelope
0.6
µs
CS Select to Unselect Delay
tRI
CS to 10% of IW
0.6
µs
HS0 - HS3 any Head Delay
tHS
HS0 - HS3 to 90% of 100mV,
10MHz read signal envelope
0.6
µs
WUS Safe to Unsafe Delay
tD1
3.6
µs
WUS Unsafe to Safe Delay
tD2
IW = 10mA
1.0
µs
Head Current Propagation
tD3
LH = 0, RH = 0, from 50% points
30
ns
Head Current Asymmetry
ASYM
50% duty cycle on WDI,
1ns rise/fall time; LH = 0, RH = 0
0.5
ns
0.6
10% to 90% points, LH = 0,
RH = 0, IW = 10mA
Head Current Rise/Fall Time
1.0
2.0
tr/tf
ns
10% to 90% points, LH = 540nH,
IW = 10mA, RH = 20¾
1.
MIN
2 - TERMINAL
5V/12V PREAMPS
PARAMETER
3.3
5.0
Typical values are given at VCC = 5V and TA = 25°C.
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
2-7
VM3500
980624
WDI - WDI
tD2
tD1
2 - TERMINAL
5V/12V PREAMPS
WUS
tD3
HEAD
CURRENT (IW)
Figure 1 Write Mode Timing Diagram for VM3500
WDI-WDI
tD2
tD1
WUS
tD3
HEAD
CURRENT (IW)
Figure 2 Write Mode Timing Diagram for VM3500F (without write data flip flop)
2-8
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
VM3500
980624
LIST OF SPECIFIC PART VARIATIONS
(described on the following pages)
VM357830
Page Location
1
VM355830
11
VM355830 (28-lead package)
VM356630
10
2 - TERMINAL
5V/12V PREAMPS
PART VARIATION
12
1
13
VM355635
14
VM355630
15
VM355435
16
VM355430
17
1. This part is non-conventional. See the specific page for details.
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
2-9
VM3500
980624
VM357830
8-Channel Connection Diagram
2 - TERMINAL
5V/12V PREAMPS
H0X
H0Y
H1X
H1Y
H2X
H2Y
H3X
H3Y
H4X
H4Y
H5X
H5Y
H6X
H6Y
H7X
H7Y
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
GND
R/W
WC
RDX
RDY
HS0
HS1
HS2
WDI
WDI
WUS/SE
CS
NC
NC
NC
VCC
8-Channel
32-lead VSOP
VM357830FVSM
Note: This part is non-conventional in the following aspects:
• It has an alternate pin-out (CS is in a different location).
• It has a bank servo mode where 4 heads are written at a time based on the head selected. (See below.)
• It has a nominal damping resistor value of 250 Ω (Schottky isolated).
Specific Characteristics
See the general data sheet for common specification information.
Multi-Channel Servo Write Mode
In servo write mode, the operation is the same as described in the general datasheet except that four channels are written
simultaneously as shown in the table below.
2-10
HEAD SELECTED
HEADS WRITTEN
0 or 1
none
2
odd (1,3,5 and7)
3
even (0,2,4 and 6)
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
VM3500
980624
VM355830
8-Channel Connection Diagram
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
NC
NC
GND
CS
R/W
WC
RDY
RDX
HS0
HS1
HS2
VCC
WDI
WDI
WUS/SE
NC
2 - TERMINAL
5V/12V PREAMPS
H0X
H0Y
H1X
H1Y
H2X
H2Y
H3X
H3Y
H4X
H4Y
H5X
H5Y
H6X
H6Y
H7X
H7Y
8-Channel
32-lead VSOP
VM355830(F)VSL
Specific Characteristics
See the general data sheet for common specification information.
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
2-11
VM3500
980624
VM355830 (28-lead package)
8-Channel Connection Diagram
2 - TERMINAL
5V/12V PREAMPS
H0X
H0Y
H1X
H1Y
H2X
H2Y
H3X
H3Y
H4X
H4Y
H5X
H5Y
H6X
H6Y
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
GND
R/W
WC
RDY
RDX
HS0
HS1
HS2
WDI
WDI
WUS/
SE
VCC
H7Y
8-Channel
28-lead SSOP
VM355830FSS28L
Specific Characteristics
See the general data sheet for common specification information.
2-12
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
VM3500
980624
VM356630
6-Channel Connection Diagram
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
GND
CS
R/W
WC
RDY
RDX
HS0
HS1
HS2
VCC
WDI
WUS/SE
2 - TERMINAL
5V/12V PREAMPS
H0X
H0Y
H1X
H1Y
H2X
H2Y
H3X
H3Y
H4X
H4Y
H5X
H5Y
6-Channel
24-lead SSOP
VM356630SSL
Note: This part is non-conventional in one aspect:
• It has TTL single-ended write data input.
Write current is toggled on each high-to-low transition of WDI.
Specific Characteristics
See the general data sheet for common specification information.
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
2-13
VM3500
980624
VM355635
6-Channel Connection Diagram
2 - TERMINAL
5V/12V PREAMPS
H0X
H0Y
H1X
H1Y
H2X
H2Y
H3X
H3Y
H4X
H4Y
H5X
H5Y
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
GND
R/W
WC
RDY
RDX
HS0
HS1
HS2
WDI
WDI
WUS/SE
VCC
6-Channel
24-lead SSOP
VM355635FSSP
Specific Characteristics
See the general data sheet for common specification information.
• 350 V/V read gain.
PARAMETER
SYM
CONDITIONS
Differential Voltage Gain
AV
VIN = 1mVrms, 1MHz
Differential Input Capacitance
CIN
VIN = 1mVp-p, f = 5MHz
Single-Ended Output Resistance
2-14
RSEO
f = 5 MHz
MIN
TYP
MAX
UNITS
292
350
408
V/V
10
14
pF
50
¾
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
VM3500
980624
VM355630
6-Channel Connection Diagram
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
GND
R/W
WC
RDY
RDX
HS0
HS1
HS2
WDI
WDI
WUS/SE
VCC
2 - TERMINAL
5V/12V PREAMPS
H0X
H0Y
H1X
H1Y
H2X
H2Y
H3X
H3Y
H4X
H4Y
H5X
H5Y
6-Channel
24-lead SSOP
VM355630FSSL
Specific Characteristics
See the general data sheet for common specification information.
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
2-15
VM3500
980624
VM355435
4-Channel Connection Diagram
2 - TERMINAL
5V/12V PREAMPS
GND
H0X
H0Y
H1X
H1Y
H2X
H2Y
H3X
H3Y
VCC
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
CS
R/W
WC
RDY
RDX
HS0
HS1
WDI
WDI
WUS/SE
4-Channel
20-lead SSOP
VM355435FSSP
Specific Characteristics
See the general data sheet for common specification information.
• 350 V/V read gain.
PARAMETER
SYM
CONDITIONS
Differential Voltage Gain
AV
VIN = 1mVrms, 1MHz
Differential Input Capacitance
CIN
VIN = 1mVp-p, f = 5MHz
Single-Ended Output Resistance
2-16
RSEO
f = 5 MHz
MIN
TYP
MAX
UNITS
292
350
408
V/V
10
14
pF
50
¾
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
VM3500
980624
VM355430
4-Channel Connection Diagram
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
CS
R/W
WC
RDY
RDX
HS0
HS1
WDI
WDI
WUS/SE
2 - TERMINAL
5V/12V PREAMPS
GND
H0X
H0Y
H1X
H1Y
H2X
H2Y
H3X
H3Y
VCC
4-Channel
20-lead SOIC, SSOP, VSOP
VM355430SSL
Specific Characteristics
See the general data sheet for common specification information.
VTC Inc., 2800 East Old Shakopee Road, Bloomington, MN 55425, 612-853-5100
2-17